Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9b3c200c27821d…

MALICIOUS

PDF

90.0 KB Created: 2021-08-01 11:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b3a4c85ae97c7cae498c4d7fd56ab0f SHA-1: 1ff2a9ccf80a74413c083249331bdb706eef80a5 SHA-256: bc9b3c200c27821df1bb323b57037e9cff5ca7eff810481c920ea2fc10a929b2
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites or hosted on disposable infrastructure, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://bhk-aindling.de/userfiles/files/rilisifusasifatabafi.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49e662422---97823980870.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35cd8ccdd1---79279690934.pdf
    • http://bogelaipigeon.com/upload/file/15981589615.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/je5or118n7hdt4stup8bfm7jtn/32952285465.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/638b09c2e945b0a2feec4cdadfd2b0ca/kaxupexisenoka.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/64a669c5fa14c305cf1da1c9ac6f6660/51495444797.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/18767d73cb1c8a85d3f847135480e282/naveze.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a7d7b4014096a9d1c09bf8730e367fbe/85063845413.pdf
    • http://cpgny.com/userfiles/files/80981997064.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9b11dcaf6f653676f8c4fc8818d1651e/gopufaz.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8e4f87155897b3bcec243d5ed53bf673/sipefog.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130ab9da0d---55817001188.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gopafawopefajodexufidetow.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/58290715306.pdf
    • http://tageedesign.com/ssmpt/documents/file/15886978090.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/powipuxarudexozoluxakekum.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a221f466c5---wexetuledakoxune.pdf
    • http://dongkoo.com/uploads/editor/files/90532821733.pdf
    • https://brakos.it/file/sisifesi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=text+message+animation+after+effects+template+free+download
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd71245b41---70813869967.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 16792 bytes
font_01_sfnt_off000110f7.bin
db8d26aa1b68b157581e1205a101af90bfff0d5cb546e60a92c2b861fe4b2805
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 17760 bytes
font_02_sfnt_off00013f26.bin
5690a36df17020f031fd420ab1acb9a4c1fcb31bb5415014d814f3bdb58ff74b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F26 11116 bytes