Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44cbfd664e96ace…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 10:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfe8a8da948ab96674af97cba103a3f6 SHA-1: 16cc7746c419c3f328bfd6dfdbfbba90ace118b0 SHA-256: a44cbfd664e96ace3a5d304fce97f4a7e477aa91863cc2cc924092a8bddc5b02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=apple+music+apk+mod+crack PDF link annotation
    • https://brillimet.com/uploads/files/202109130207122037.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/49924821768.pdfIn PDF document text
    • http://short-story.ru/upload/file/8706216428.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/91282183611.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/vomelodotisojonuruxo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/59677443301.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/sexapujopun.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/bivogigoni.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/909130563.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/78695064728.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/61222736276.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/55250624968.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/xepexokopeke.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/85399949929.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/iunaa46b0gtim5babn1auhrfr5/76786113250.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c198355383---kuzagukexasufamagigizul.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/74205077923.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/93325664422.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/genex.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136efea7ef4c---towaramuwewo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fa6d25e0---fapugiforaf.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/pikojanetosi.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109072204297269.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_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 19340 bytes
SHA-256: ee457bccf9102428da97bf4d154a49a92d6a58fc5c12a32f49b50fb9e6f1271a
font_01_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 10648 bytes
SHA-256: 50f32c7481ea3848d43a020659f63e97b61d2946abc5dea6c628378d5a27add2
font_02_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1