Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac273d3d1a9c7d3…

MALICIOUS

PDF

89.3 KB Created: 2021-08-02 23:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf437510c3b82b226feabbc5db15bba6 SHA-1: c4e0132b7cf55d900a9df8954357d1833c9dd8d8 SHA-256: dac273d3d1a9c7d3990a9fe516c65b2869614d6a746e7a12ad97ea0107171587
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple compromised CMS upload links suggests an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a394074b89---41256650198.pdf In PDF document text
    • http://buergerforum-tirol.at/file/nuvizid.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/pudalozifogamizope.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4cc78032341195a33a50e7bfd39f05fd/72701963709.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gb8tlbskkgdr1rs02va9urr2r/24301219988.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202108021303067448.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/barujipirirozaneki.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/birugajol.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/fumod.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/27687575037.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/xefuniwaxaxamupetebebewi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/21664164643.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4252f642d586f598230122089370932/tizibigafupowufudar.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eafc017581e1da41b7679ed3287f4e14/24291713976.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/15456085383.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/85894906681.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/guwirazo.pdfIn PDF document text
    • http://maidichike.com/upload/files/13223744710.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/42067577782.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630763c58c---gomalugixobixanazaso.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8cf7c72031c2b839817cb9d2e30c401/29016986312.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739bb0f375---rifabudojofit.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/befedaa168b6a9f2ca00d8e2235eb6f7/dibabedagizifupajutofogi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e8e544229---50652876278.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/30380834351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=plantronics+cs540+wireless+dect+headset+manualPDF 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_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 11156 bytes
SHA-256: e1050476c7443cd50211f9440ece4ed5b3233bdbacc805b3374184cb964f644e
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 17564 bytes
SHA-256: b63cdf1a676f599b0dd0f931e1e517d92e62f5fb7bf6a29fc489b40ecb69952d