Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce56e1f38332b57…

MALICIOUS

PDF

98.9 KB Created: 2021-07-07 23:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dcefc6385a068569032e21b465f9472 SHA-1: 3854c65ca9881083e15c8a007f44e194bc431e1c SHA-256: 7ce56e1f38332b579e36b4f76980bfb4e48b39f917d5cd32f8b6a5009555db2a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and a callback phishing lure, prompting users to call a phone number under the guise of a billing or security issue. While no scripts were explicitly extracted, the presence of numerous external URLs, many hosted on compromised WordPress sites, points to a phishing campaign designed to redirect users to malicious content or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=wither+storm+command+block PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e90a55bfadeef0a2d01e0d26213592b6/9650353061.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nl99qre8aboi3evarncr9q9dpe/vunideniwafokob.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/025031a91dd990c7fb773067caa0092a/mulut.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca86f7b3f7---nelovemapekim.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4e866dd4e92471819e7a2b88d08d981c/70078076704.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/55525395950.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/48438555407.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/semijaxafenusofogobij.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801d3608c7---39954864823.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/94tt066a79banvgi4msrpohfi3/89518093898.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/begemasev.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pilokekibol.pdfIn PDF document text
    • http://markone-tools.com/upload/files/49145973514.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8a164bdd4fab8040637ee0bfbd0dd200/38495484191.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/46935625063.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nivomazamisekivusap.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/timebadukovejeledivuset.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/16693927689.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/50481530628.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68380ce85---kigeditiziwadetenubusixe.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/27896671025.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d309f32028---jikubevegeviniluvigofixa.pdfIn PDF document text
    • 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_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 17900 bytes
SHA-256: c8fb3528a13f4f5ee9a6bfc9275b938a1be7fb50a865f3b57712e43d1d5bd730
font_02_sfnt_off000163fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FA 10860 bytes
SHA-256: b322bf0746cb84723551df1dd523b1de842de59f67977ab361d8e3837f3b8041

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