Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cfc97a802308b3…

MALICIOUS

PDF

104.2 KB Created: 2021-08-21 18:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 600ab4873373bfc0c7ee7a25e72f2433 SHA-1: ab882dea84099f7bdee333f43ee5f6f5e34a35bf SHA-256: c0cfc97a802308b3bdd53bb047cd5b208156b01c4539766c9d11798e77586863
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to potentially compromised WordPress upload storage and other disposable hosting suggests a link farm designed to host and distribute malicious files. The 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' heuristics indicate the document likely attempts to trick users into downloading a file or calling a number under a pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/katutekuzudiz.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/lunezusawimivamawewiw.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/doduzozaxiboravufifivu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/xokuvek.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/topefarasa.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/dusuxolebe.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210724_233240_200.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec70f0eb3b---zebulenurajuk.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084197ab776c---89967361309.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5aa0126408cdaa96e6e66c7d1437a880/pitaxejajodadugux.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f10fcb58b---82000119429.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1rtqpqtlqrb98d8piatvkt8rn4/memamopuj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9251104e4674a9c7e838d27844c36306/95706149383.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/pofinutowafototanuliwa.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f00f25035f---30740098348.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/v89og4pce176lja8v9e5vac7q7/gabumak.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/093385d63ba372cce714fc0825772efb/suduva.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/beriforusumegibuduv.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100981e5e010---19914752835.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160908bd96eee6---662740718.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6fcb29f15d90e70cdd684981191d521c/70913171773.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f290d125ca32c0833845c419d1b0fe2e/43871749984.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7c6a53ba---zewenizopej.pdfIn PDF document text
    • http://camwater.org/media/files/44527508865.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead8891542---78301061967.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/83732992938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jumbled+sentences+exercise+with+answers+for+class+10+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D0 18620 bytes
SHA-256: 38ab2a2b2f79d48965f9494d7b85b1d4d4bf402308a2ccbb8d983f61760f65ea
font_02_sfnt_off00017724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17724 11480 bytes
SHA-256: 08c82981af2332ea44202eb9fb25f8c9cbf1ce2579665a27d4261a2d194e6281

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