Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aafc595ade2136a…

MALICIOUS

PDF

76.0 KB Created: 2021-06-13 10:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cf439dda05e9ec9dca7f4b9acecf8cb3 SHA-1: 3a6b7d55e7de90afc219559c0d0a785854564842 SHA-256: 9aafc595ade2136a098d2ca2c1d748f65e401ebcdf151a4039b7163656663543
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crysiq.ru/uplcv?utm_term=weekly+schedule+planner+excel PDF link annotation
    • http://fenotropil.ru/userfiles/file/wunojor.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/830078916609e35ef3d0b8.pdfIn PDF document text
    • http://berbun.com/user_img/file/zajawotazebetov.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed32a2732---67054063577.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/20178098396.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b87de552667---5804381001.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/dfef42833259a251cd2dde8c0b35499a/49879057042.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/hu0t1q7vq4at2vr5i1fu8q6fvf/dovugidunekolesogorixu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6k7l6177q01sbiajgj2bcs3cpt/vozopufujisu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pn07olspvi95dpluc7mcarciel/68406369416.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/vuvadixajasaveboveju.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eb2675ec8a872e9ba58cd144d7b12caf/zisepuxesisip.pdfIn PDF document text
    • http://akssert.com/userfiles/files/94709667640.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/jqd78588srqf4rbc86u6l3uei7/537734685.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/28847005450.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c035ec6fc---nepobuwunoxuvixigugi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086925cdb75a---91617704174.pdfIn PDF document text
    • https://papiratisk.cz/soubory/rijuxaresabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 5408 bytes
SHA-256: 02a6a7dbd690a719e95af3f089b06a965e5c54f64d4e7e8f7187307f7db56107
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10860 bytes
SHA-256: 9eb15008955fac517da7bc6db715b8757f1cc45e209044c5131a176139d00d7c