Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc8f48575dedbc6…

MALICIOUS

PDF

101.4 KB Created: 2021-06-30 14:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 981eec619b6c6a4245ee6ac68548ff16 SHA-1: fc74d585f0c64588e397e7b3989203f26a028698 SHA-256: 4bc8f48575dedbc6cb26fc085d3494aeeae5d51219897c670364a1d1bccc5b6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host malicious content or redirect users to phishing sites. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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) or Microsoft license-boilerplate 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://philabc.ru/uplcv?utm_term=ionic+bond+formation+of+nacl PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ecb9ebb9---11812673336.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/korixurosazowumezopabamab.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/62842180841.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e437ba1b0---74340827461.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/34975296008.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160815ebad0e9e---83255795261.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c954c1377d---ridomuzuje.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vmh4f82khojpjgf5a9637i961s/56662987102.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/xozutu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f4cce9150e3d3f013608234b5bf5a90/33131467703.pdfIn PDF document text
    • http://chapelguild.com/images/usr/josukevaruxuguvinula.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qj9sfsrf0boheit6scmpur85sl/23769033613.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b14aeac57b---41262236311.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cde7869e430db674a203e9ea87c1c1ce/buzejetakemokupomew.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5376778e---dazojokekexugirovu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3524b1f9ab3631e7a170e791cce74661/xuvozigoses.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cc4f0faa36a1508503c94e04492bbcc3/ravor.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9610ba7c47---duporixazomur.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7a9bf518dfad591caef9e91f29480cd1/vavufuwepogil.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b35a885d2---88035634274.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/22803912964.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39f92d029---10468059084.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/vubevipu.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_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 20000 bytes
SHA-256: c4faa2b55c67d0f5a5b5bd330ec319709d3708c9a92615415dc489d7ff82ff4d
font_01_sfnt_off000158f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001710a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710A 10428 bytes
SHA-256: 11b220bf8a390316c75ae4d2f3f0485dedfc0e029151adb7b51b23ed4647c4c3

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