Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa003c6ceb8a404c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 23:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed4ddfb550cc45028925a76ef3879882 SHA-1: 3bdf346efababf60a0a295d6c1c09c28a8058048 SHA-256: aa003c6ceb8a404c0b0170a35e0adb3d71b2b8ed4548eca575df90593c487870
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tbeaindia.com/userfiles/file/repalabobitafewiwilut.pdf In PDF document text
    • https://jasz-pap.hu/UserFiles/file/telaredude.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/derikewazibo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/57703982099.pdfIn PDF document text
    • http://proxima-design.cz/files/file/sesitaxuluvol.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/bixusevutar.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613733271249f---wobetutiwotizuxivix.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/2802388244.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9741856826136bca100f95.pdfIn PDF document text
    • http://eichler-kammerer.de/73722238918.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/18025534140.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345e812ac2b---62968424963.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/21680180651.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/26815082531.pdfIn PDF document text
    • http://clingac.es/d/files/42757736413.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0b4i95niitpdetk2urp946vnk3/70439409762.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/jogurineka.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/detese.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/38533475915.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/68326652919.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/gosixubokoposev.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zunolexatebidevijili.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/15183259185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pikashow+update+appPDF 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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10516 bytes
SHA-256: c2655264c47e02310d6c1f01fdea8c825e2a4322e26fbabe3e57a4a7f7d6696b
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 17848 bytes
SHA-256: d1df9f1ba0705c75732cab37c9a7e7c6a732418d79a5d71f0e56967782df825c
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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