Malicious PDF — malware analysis report

Static analysis result for SHA-256 925db0b51a58abc5…

MALICIOUS

PDF

109.9 KB Created: 2021-07-15 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed0ffe27d5b6bd1c4f6070a504a7f628 SHA-1: cf282ad0a35dcd27f98f5decff4c9fce580f4939 SHA-256: 925db0b51a58abc5f9a804f8a126cb98b194aaa58042067c0586d02a7a6b1c5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is part of an advance-fee scam, luring victims with promises of lottery winnings or parcel deliveries. It also features a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the embedded URLs to host further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9794

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://nffcd.org/userfiles/files/pokufudituduwodozo.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/rijumejezopujorugebajan.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/13852068736.pdf
    • https://serviceservice.eu/userfiles/file/99840391222.pdf
    • http://gat-asset.com/CKEdit/upload/files/bofamivagumerejomawobogi.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5e8b3e1c29fbc8bcd0938790da6a1734/9445331988.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9e3cb01afe4c0006cb8cfd8da80a01b/40130705053.pdf
    • http://clasesholandes.com/userfiles/file/84028468387.pdf
    • https://karinbentum.nl/uploads/file/36103090382.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff3e6d1fc---4906291369.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863348fa0a---bizovororopokukatonewowam.pdf
    • http://mclarenquartz.in/ci/userfiles/files/23895431708.pdf
    • https://my-natural-style.net/upload/files/tonabeluwadir.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609427bbde5a3---kelijozusetaguzojosib.pdf
    • http://blankheich.de/images/uploads/file/mativimevolu.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/v3tcfp3pkkr6okbkh7qbqhm88i/bunit.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8dfa74499f8e3ab6c26ca05d854ebba8/43634904905.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/52461015965.pdf
    • https://allcreaturesinc.com/files/files/85298360420.pdf
    • http://bensonlandscape.com/editorData/file/denevudi.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/72693805406.pdf
    • https://asiarsolutions.com/userfiles/file/kemarogegibamovo.pdf
    • http://aimic.com/userfiles/file/49443029164.pdf
    • http://robwalker.net/fckupload/file/51695605511.pdf
    • https://tepihtrava.rs//files/danekenaj.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vlq092e8r3autsp6b4a6qbhgcg/58885988786.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cleisthenes+reformed+athenian+democracy
    • 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_off00013e27.bin
aba34434dff4da02e835fbd7d7fe43366a4dcc5665f7b8c46c24e0f5986ded67
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E27 10888 bytes
font_01_sfnt_off0001572f.bin
2d10cb4b032f8a65a1d61b3f21dde06e9c1d8357dff4673707acb422d6f55578
pdf-font-stream PDF embedded font (sfnt) at offset 0x1572F 22788 bytes
font_02_sfnt_off00019062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19062 16792 bytes