Malicious PDF — malware analysis report

Static analysis result for SHA-256 81acb46c3ea0cfc1…

MALICIOUS

PDF

70.6 KB Created: 2021-06-18 15:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 69a059af71848d7b01a160625b4c7b13 SHA-1: f1e4b16921bfc39e6d6bd259fd062d6549b808c3 SHA-256: 81acb46c3ea0cfc1d9bbaa8cb482e58cf9367066c1e4a72094d4411615d33388
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous external URLs hosted on potentially compromised websites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://laborke.ru/uplcv?utm_term=cascara+de+tomatillo PDF link annotation
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/336719253b559745fa852c7ee04a7453/filugaponulezuledi.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/basopegavexorokajog.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/91121728754.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/78525768629.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/97916362415.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/v9k8phfilc1p3tnstsu707v8f7/13176742100.pdfIn PDF document text
    • http://wenxuezj.com/images/File/52613753532.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/70dfe63c20fc4ad86d21d5e2c4279c4c/37888663436.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/68328100839.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3a8b675f---81200474878.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ec999ca3f2a56bed69f9dabbf2919602/wojilewimepukorikawam.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/g7g9vknhdcig5hqhpv7qbi09i7/sazisedazugoxuzagal.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/sedujap.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f08e381efaaec9d808d8b1e3b61759b/ripadebaruxovug.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5a4d71bc8bfb7a4e70cc6ed01985e4a/31036652183.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b444e7d5---lifovegogorage.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6279d861e---suramutupezekobolewuv.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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 4992 bytes
SHA-256: e7181cfc4d2c452ba7342f181650396f4bb45dc447d512ee6096c66d58097882
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 11948 bytes
SHA-256: f06884aaac7f491e57037d56e0a322cb59c78f9346bd7b2f30a2d538bc0e394f