Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be70356a6e58416…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 05:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71d96dd2e2e7b7b17d183e70fbf668e0 SHA-1: e91a2fae4ad94d0b5e450fb8ee3ae9161b8b4731 SHA-256: 3be70356a6e5841624fe50fccc843c6d90e4650af64c31dd96df8036cdca1f9d
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the overall structure strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=best+racing+game+for+android PDF link annotation
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6eb914db5541eee5323018f5fe4f750c/88911347690.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/delavone.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/64397264350.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/wapulil.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c205eae4c---xemesedobada.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/31459902394.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/pimakimabirarawot.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/16593801422.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/50318067594.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/meselalaxasuludinonatufo.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/kikorijagoxasolofezeko.pdfIn PDF document text
    • http://osayit.com/images/file/47030590656.pdfIn PDF document text
    • https://gangnampools.com/contents/files/19896468714.pdfIn PDF document text
    • http://techbis.pl/files/file/deritunewalakureg.pdfIn PDF document text
    • http://favourtec.com/attachment/file/lagigonimub.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/35116107026.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/jafaduvezazu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967975feda---23595708905.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/manosixejexivet.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/97597143495.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/pofituvefevuvazakafaguf.pdfIn PDF document text
    • http://eva.am/files/78d361324ff057b0.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/59436380474.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/15586668184.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/13438368281.pdfIn PDF document text
    • 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_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 10828 bytes
SHA-256: 9d24e61405762cc8046f911c23ee7194076c738368ad6c95ea931656e74030cb
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 17952 bytes
SHA-256: 816f26140582d2e96e3f0f632515a9e4c0205d3e55940bbe2134457e6113551f
font_02_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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