Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c159943073aa80…

MALICIOUS

PDF

81.4 KB Created: 2021-06-22 15:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02e94320f1a7a01d5ff7572fd427ed30 SHA-1: f03df19e97ee4914822ad52b7598f2d876094a03 SHA-256: 16c159943073aa80ecedf187635443a4a6d61186e76609800da8c1686eb3b508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The embedded URLs and the overall structure indicate a phishing attempt to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/43896996169.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839f6a4f3be---selidegiwuw.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eed0625d65e33d02fb5bd49628a4192e/tadigexigosexukejiwa.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qd6l9pflsc6sflmo07auok6d33/xibilifemivo.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/99365387620.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/xuvexuninesili.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/aaj0k2ku9dvejikdb9ctr6ra26/52594298837.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71325e824---85540174770.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d17a14193---27047332009.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a016a741---jivuvamowojiridewo.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df7716473---puduxowakot.pdf
    • http://abacusnancy.com/userfiles/file/tigisojudemosepuzateneg.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/41c840da53329f8eabbc21d059896745/81189247549.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd47d2dcd7---2210197581.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608341a850a6b---36006959858.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+shivaji+movie+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe72.bin
884ad31c2c02daf436d361ad94f6d86c4ebc42b702bddff383ea4523bbe4dc7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 5372 bytes
font_01_sfnt_off000110b9.bin
4924a2d09faf5c45f558d9ab774b89ab7251719f0c5d108888c8040ecba6d398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 11300 bytes

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