Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c5536b3db4e87f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 07:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee95648117ab8263290f5ebcb18b9cb1 SHA-1: 09393addc2de0711bfe1a755cb55bd278b876449 SHA-256: 15c5536b3db4e87fb3f61b8ccca4c1904fdeaaf35ec36a42e965e99575fa4041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a likely attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=dehydration+cause+elevated+heart+rate PDF link annotation
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1610069684d194---99724490330.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/60414240682.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hqoqku5or0qd50mr4e6cle6v95/22188695936.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/buzudesazakezeso.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d481f06c21---bexugakugixada.pdfIn PDF document text
    • http://sgpeo.pl/users//file/bakemejuvoduv.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7d2f3ba7---kenowujupobuvokaxuxorejid.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/rasajogoxuvifetukinejo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/galut.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/28184577924.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/51263628908.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b21e2bff3---45784732826.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aaa986318---kizazukalijuredoxogi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/jesiv.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e0d78066---dimawibexofux.pdfIn PDF document text
    • http://qca.ch/userfiles/file/siluxilikipalefikeg.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7c0b55322---11909676732.pdfIn PDF document text
    • http://m2m2design.com/userfiles/812456741.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ac7701a08303291fd10d4fd2e9e4a992/12191796466.pdfIn PDF document text
    • https://dacola.com/upload/files/98733634312.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/63657605950.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180fced2d70.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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 17628 bytes
SHA-256: bf0124f23d550cc0ca81ac5703078c8e0e1c1b2f2b91397a3175e18e34a6eb63
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10748 bytes
SHA-256: d4229e9fdc966db368ec8b284cd5dc948ba748f85b04f8173fad6a317fd06a37
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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