Malicious PDF — malware analysis report

Static analysis result for SHA-256 223c837d3bf5cf45…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 09:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e123e89eada0188dad4b8b6a7b1bc84 SHA-1: 886aaa9c64c369594fc486c79230a09f15b488f8 SHA-256: 223c837d3bf5cf454e36275bc52810f6d69c7c277413717926ed651624dc3147
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs, many of which are unknown or point to potentially compromised sites, reinforces the phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/dc9814bc8533d4a5a191a76259f0303b/giwisor.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d708e3ec8d2---sudumowobiji.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/rafokug.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/powugavifelege.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/809ccec51f584a4bdb99ad3f3b77e1fd/miduvoxapadevifigurer.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ef30a71---18511846177.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/37614692462.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/zetotirumajonokewabe.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607989a7eb15d---dapulemapefam.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2faef279---zirebugukibararid.pdfIn PDF document text
    • http://chayka-svg.ru/files/sakatopagetezinipe.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/badex.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/zifumov.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/wifebidekufagawakamorugi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937cadbbfb---61643596924.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff950bec6---23217119229.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cr72f230fcgge9hgcd69m6f9sh/tuwutogemiwekamuz.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/44434671129.pdfIn PDF document text
    • https://maisonforville.be/documents/file/1837816159.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3772f235---70551376036.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5a07979---66014324583.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/785c67dd784aa593830218b6ee05c3f1/24999446907.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/pudowisigaro.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/daf337aba0e3bc3d5b9c96625ef17d03/54061453454.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/71097116308.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/gavinojamadazoter.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=democracy+wall+is+located+inPDF 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_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 10732 bytes
SHA-256: 63e780cd769dce464288adf29eef7fb358b2b0676becb14d519f077a9cb80c44
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 17108 bytes
SHA-256: b9950836b0f7973fe8ae0ddb0312c9797dae3b7cbbf5f2bde55b7e4196587462
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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