Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d958331852e08d…

MALICIOUS

PDF

91.8 KB Created: 2021-07-06 00:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf2f05de7b38e4574e5283913950337 SHA-1: 5f34e1a045209a0bb508ec3baeef5dc5e340cbd2 SHA-256: d8d958331852e08de2f566c50cd66a2655e4f646224b6279c7b17662563a939f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://dientrotiendathc.com/media/ftp/file/sagawugedelonoz.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160accf9fbc178---47999462547.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8425dca9972a3e0613da48725bef3af1/84277808152.pdf
    • http://winso.tw/userfiles/file/tutonozegamesoze.pdf
    • https://bselink.com/userfiles/file/sanorimobemej.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rodezubewamibif.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/52471d2b5f61739eb8d77148a8a7d511/64078023132.pdf
    • http://clubselectionvoyages.com/images/file/99513571856.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6d982309---jarebujas.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/512231686ed02034d67d6e817dc06f6b/76167166594.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6421b4cca---rujubafepobutirujilifinel.pdf
    • http://asbu.net/uploads/FCK_files/file/17321646721.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4058a1112a---15330618515.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7i2tr0iqm6edkd7nb26nf7os97/jizezelalopemekowurimivo.pdf
    • http://patriabrno.cz/userfiles/files/9283563370.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/30f0c2182bff3cc4d01f9728dacead19/mobufar.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a97ae2521ee80e1849cb52bb468c839c/61459434575.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/645a76ee773ffccec4bdd580ce032af4/91883239237.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/eagvit4dsjdngu8nen597ri1h7/jukopile.pdf
    • https://activepymes.com/pub/file/87237783533.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9bc44cbe69dca81e27708204a07930d/80286679529.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da666383b---71312274656.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cqcrjvgaqupoa715s3327u7492/93714069603.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/34630823317.pdf
    • http://ilkyoukais.com/Images/Media/files/48472020726.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rifle+merit+badge+requirements
    • 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_off000102dd.bin
57c66b3dd609a45a8dc574a04d5a57336d88e0aea7fa1f4964af766dfabeba4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 11008 bytes
font_01_sfnt_off00011bdb.bin
fc35b48fe8c1d815622399e2e53c002dcfbdb2aa30adb6c5c2015ed4c2c5a9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 17324 bytes
font_02_sfnt_off00014987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14987 16792 bytes

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