Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e44cbcbbbc6d14…

MALICIOUS

PDF

94.9 KB Created: 2021-08-08 12:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7c129886c63bb4d9d0db373d8eb9a64 SHA-1: 71505be91c3643d11bc347dc467bd4d845b9053c SHA-256: 07e44cbcbbbc6d144af92d7130a043bd93b9640269ca1a68151377ef5d700c5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the structure is designed to distribute links across many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66f4e28da---98340898323.pdf In PDF document text
    • http://benrassam.com/uploads/files/98495627049.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/79831598794.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d724aa8b6ad---paritupa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44a361d8038689f9f84525fa837fc6f3/dozajaraxoj.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/57068364518.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/filafalajisusasijow.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/4510431171.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bc0db613dd6f18d6a2177c9ab1d0f6b7/34602237214.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57331453df---tafuduxodimeramimoraboj.pdfIn PDF document text
    • http://myphamasia.net/upload/files/bofogab.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f694b8970---dezasobapi.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/40595758193.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lqjs8qhs8su9nhjq1b0741h50j/kopogetoku.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/7248760710.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/fozafikumotajukedokodo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/eac720990699214068b291eaa2e1bc7c/bakafapibum.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68a7f20da---5239480251.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/47h53tmuqm3o7ruol0d4tq0229/dimumavonejofebawa.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/9045981057.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3624c6f857---28185955022.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f7cc69d9---vanud.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d7c367f---58055391689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ark+reaper+queen+spawn+command+not+workingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18444 bytes
SHA-256: efe6dafa65ab2497280da6628cabd5cacceaafb15eb730b7868649e739252ba4
font_01_sfnt_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 11216 bytes
SHA-256: abc7b7d71a3173e66af48d73d62ae6c2a99bc9c593fc652c1fdcb7139023bac4
font_02_sfnt_off000153eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1