Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0042affdafe5ff1…

MALICIOUS

PDF

97.8 KB Created: 2021-09-07 10:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc8e516b2866891ee723c87c096ed788 SHA-1: 3df655b4f7d0e9d4231bd75aba18cfb640d9cb63 SHA-256: a0042affdafe5ff107fed65211750de379c759393139aa849ad0a95170cfd98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727e20734c5---sinewere.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd97977c539---demonurizofuxu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/nokemobi.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/19316912286.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/wedazusovadu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083202637b08.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2d6f3803f83eed68c16200694539c60c/gafawibinadib.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/58187890508.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8343e23333631ce8075449aeb483fca9/89579998588.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/228d46894841725b27cca96cd93c77a9/13575540611.pdfIn PDF document text
    • https://bagstyle.uz/images/file/savewiluwopopipumiwosi.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/73a3c68d323030b2a09950e4a388c729/punuledoxino.pdfIn PDF document text
    • http://gabortech.com/admin/file/62685699961.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/kukavi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/230db0fa0ecb6adaf50fc9f97cb9abc0/44859881702.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/32830268336.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/37390720164.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e6129282---xukejage.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/4285542207.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/95398626934.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/9901815805.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/vavewuxawide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=idsa+guidelines+neutropenic+fever+pdfPDF 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_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 10912 bytes
SHA-256: 980fef6f83969b2796969c690d63031cdea5af8a44787c98a435f4d8305ba9d5
font_01_sfnt_off00012f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 19288 bytes
SHA-256: 40aef63ead3dadf024495923ef390f1e143e79396533c18fa60b9e0b768c93a8
font_02_sfnt_off00016138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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