Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e56b698327680…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a73d2308375e974b436e3cb935a34f2d SHA-1: 76fa14b193f0773cdb3a22a1863d3949ae63e8e5 SHA-256: 9b1e56b698327680d0bfefd4309a310400e4ded7d604121fe4d1c10ee803263e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://istvietnam.com/rich_editor/file/76853139271.pdf In PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/dixex.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bacbd01fa---63122404556.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9f1f311d013ef621536825fb44e39ef4/totoxozuvonajuv.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0c1eb599---16505071852.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0362d9ed---33056413053.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/pedoweninolesow.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/papobolewisuxode.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16108d8ca3baae---nomuza.pdfIn PDF document text
    • http://0048.pl/48files/file/24625780097.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/xibime.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/guseziwudo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f6681c374a05bfc69386b31000c0d469/remegaduvakapex.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/84061745313.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/45723425630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ieee+829+pdf+portuguesPDF 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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 10816 bytes
SHA-256: 187ac70d602800c958fb1e9c55f14f44159237b6e2cf1ecd1a858a2dfea9f76e
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 18188 bytes
SHA-256: 0e3ea2b4c4b572a84465cdd527485fc9c81010a0f8ca6e1427b202fbeb4bde44

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