Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2cee080db7ac20…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 21:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb647c54116e5f68f20c617a092241af SHA-1: f91fbed6809cfbbcc5e691d1b071c199b3d03d0a SHA-256: 8e2cee080db7ac20ca8bc0f943b1410aab5f03340923bc8604f1a991bd7e295e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, many of which are compromised WordPress sites or use disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of embedded URLs and the 'link farm' heuristic strongly suggest the document's primary purpose is to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bselink.com/userfiles/file/lenasudozebovubolifij.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c696a480c34---1100881221.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607592e9412f5---zatibonozoraxunojazevotu.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da854756ce3---solidepatafaxema.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4331e6e9c---xofivetokejifumuxigu.pdf
    • https://samngaimarble.com/html_upload/file/sitax.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/32b425d47a63323690f76c9d57e371e1/64828200911.pdf
    • http://machinegroup.ru/img/outer/files/lutipen.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/zunaseboxafiju.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6081b7290---senekeluwetakesibi.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2ace50dd1---47755492568.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/27415196962.pdf
    • http://klhl.com/userfiles/file/38832266823.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/83d407909d6853b1ddb67e3f2b0fdd75/87649580907.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/65a9614b15cc1d1af658a9c768656a9f/pupebuwikuviwawokesepulel.pdf
    • http://absolutelyneon.com/userfiles/file/gagebibazoxalozoko.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c5a5aa4c7753b122682c376ce0f0f18/jinixomuzedu.pdf
    • http://tuning-zone.eu/userfiles/file/pisadumorowokumipusefosax.pdf
    • http://wooshin.kr/uploaded/file/132865911060b3bd9505b47.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/99b887a1e9afdeb9b45889e568a60513/67610479507.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e63cd9711---68915712779.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0e09370d---70754163322.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c711f931a9---54849523366.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d171d0fe5e---41211139761.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4e907a44---97837688752.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=feral+cats+for+adoption+near+me
    • 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_off0000f17e.bin
4699ad5fe95367870b1ed2ca6fea2c868e5eafa2f6976d05a1b8d0e6318a095d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 16552 bytes
font_01_sfnt_off00011c21.bin
0380fce75f51fd323e6e52eb532f24291d0e33c8a9a6052b1a6ee4d92e0a1b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 10756 bytes
font_02_sfnt_off000134cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 16792 bytes

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