Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5f0c0c6fb5dfdb…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 20:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a27e01241b05b70d29509263ddcd902 SHA-1: 3d3c0d3b10911959fef6c37a0dd5237c27173bbb SHA-256: 5b5f0c0c6fb5dfdb6298b748921c4ec5deb034c2e78d3fe219cd3dba5709b8cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains numerous URLs pointing to compromised websites, specifically leveraging WordPress super-forms and formcraft plugins for file uploads. One heuristic indicates a 'Callback phishing phone lure', suggesting a social engineering attempt to trick the user into calling a number. While no scripts were explicitly extracted, the presence of compromised CMS upload links and the overall structure strongly suggest the PDF is designed to host and distribute malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/14a925bbedd9ac9e13175547accd0de9/gemetanobosikokep.pdf In PDF document text
    • http://www.peretprod.ro/content-images/file/zisur.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6f697fe4ec224d7d62a0a60ea9eb2295/20569479748.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b345f435c86---313372561.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39439f2ad---ferolitoratozegufivevobo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/kepokojusixejikegi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507102506384342212.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/548b4508fb4281aa9edf5057ba81efbd/59237414988.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///3437688640.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t6173p9neh68siagvlabcc5d66/bifadodepitimopanawavap.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/xipojujemuwidux.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d9dac0a6fea---masegezas.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cbca67e04eb242b15c2faa9828ae0a63/28052412104.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/041155431256.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/47330868665.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0442c8ceda---80603587850.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5quktgc91lgoncd3i65n0j9n3/55231516315.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/71730047718.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/42303756049.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/50003719645.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/86rf3cb7qpvlr0e5isvkn4ir03/kopebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pitch+and+putt+hoursPDF 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 10532 bytes
SHA-256: fcb2c776b83e23005e66d43924f8d0b1c9222f15cbfd76f005bce6b50e41694e
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 18576 bytes
SHA-256: 50556c519d167d0fcc15c8a32dd0a7abfc568b8279a3571451670cce76b0ad84

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