Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d7b94f3cab27c7…

MALICIOUS

PDF

119.1 KB Created: 2021-06-30 19:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f0d65b37b167d3b6d28d8fd79126e14 SHA-1: 57ab543aa89b3b015f3d1b1f4fb851a5e870fff7 SHA-256: 75d7b94f3cab27c73c7809ad77db4f53b31e2166c502945d31cd10d79580f63a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3a0df023---mukofivivifalexazoxas.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825e2497d6---82472226512.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/dezezojuxak.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d2cd2532---36326543833.pdf
    • http://videofilm-tv.ru/content/File/pokigozil.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ed3bcb3c06f57edfe579f0c8b2145b6/8486370506.pdf
    • https://dienlanhhonganh.com/images/pic/file/motedofixinojoposejinabet.pdf
    • http://musorcentrum.hu/files/article/file/50000619420.pdf
    • http://rwdwebwebdesign.com/img-aim/files/xisimug.pdf
    • http://www.toeterloeh44.de/files/rudikasalaluzutewojiw.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160725b5d0fb51---42966109580.pdf
    • http://katachizu.com/img/news/files/74960072287.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/38ccfa9949b01be8b87aba80c3a2368d/zinov.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5729fd6e0e---15527052538.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/g1iva8134r2v4ng0ak2aeesb2o/pibokupusogugofi.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ce888465---fapimarulibe.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce4b896d9---34261598958.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd1d218eb---xogapavunilewidigafa.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6m78vqlejikpqv3fuc6dfkmvu3/18771043089.pdf
    • http://unicorn-furnitures.com/d/files/relazaluduradekapekifogo.pdf
    • https://stmarys-perthamboy.com/upload/File/xowosawukenapib.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080179b9fec9---88977359821.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/wegafasez.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/55395434594.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quotes+about+economy
    • 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_off00016f92.bin
0f1f4c76e9a2bd11860443f83c513701cd5999094da97bd58744d4f5cd1f7c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F92 18004 bytes
font_01_sfnt_off00019ec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19EC4 16792 bytes
font_02_sfnt_off0001b6db.bin
c6cb2e5b91e98e88827015baf393500799c0a84c5d3a230fb3b8ded491c6178e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6DB 10568 bytes