Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85906b947dca8b2…

MALICIOUS

PDF

83.8 KB Created: 2021-06-20 23:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8896aba9e66834bcbff9021c65cd7b SHA-1: 012e110ca35a68352c24cdb0f29215fbfa2d111e SHA-256: d85906b947dca8b232cc6e7e6ad62606331e31bddfac552bf332ee96bfd7f29e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to IELTS speaking phrases.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea8db7c2d---79999019180.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/52471d2b5f61739eb8d77148a8a7d511/64078023132.pdf
    • http://cropscipublisher.com/files/upfiles/file/jifijo.pdf
    • http://lws-realestate.com/userfiles/files/forimedigexaper.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8fca9fdb000945aed3bdd279ff9a9c61/tevememetilal.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/osvlnhgd5dslflsohvuf2dsjl1/raxazazibole.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9eca3e77---sajexoludedesifuj.pdf
    • http://teormech.ru/teormech/usrimg/file/87909509720.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4769cdb34948ebbf72e0a39f69a22db1/2783163411.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fd4fa84223afc98deaffc607b6d62706/56678775973.pdf
    • http://nakatka.com/files/file/47120431714.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbea56ebe0---puzuvulipadubigowinezuvu.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160941d26200bd---sopepepir.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160975ac2cbe32---37116251176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=speaking+phrases+for+ielts+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://scripts.sil.org/OFL
    • 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_off0000e7e6.bin
6b6c858aa7e2a5b9bfa25426f63df8b3ae9e5f603c0920b516d233389daef07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 5472 bytes
font_01_sfnt_off0000fa7b.bin
feed0c8d781b69da42de5b63a848a91698a4060e096130577ee907cf4430889b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 22324 bytes
font_02_sfnt_off00012bd6.bin
9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 16068 bytes

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