Malicious PDF — malware analysis report

Static analysis result for SHA-256 3135f0c7758ac4bc…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 17:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fc1d39e021b04eaa7324413d5f54dbd1 SHA-1: ce190e5462a9b0b8b1e76cb0308ec707e86f0c5d SHA-256: 3135f0c7758ac4bcd7e4631bd0d16a35d90b4ccbc1751d21c55a1346c93cbeb5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=bangle+ceremony+invitation+template PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ce23fa7d99693e5909329b786ef9f0f7/68143286255.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/73d4ad3a7e9a94f268e7861c94a8a228/datubonugebirukuko.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qs1m60gkv5jrdljg1gu3tk4uj2/suseguxofovi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vedixolotopunemefimim.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/13bd22c901452c90a2df04406aa84d9f/wavizopus.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7f0f2f8778e8558db5fc9dda1d1d96a8/90702084300.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/51389553291.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5821304ed7c0e71ce82257ba78376533/9566011868.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721359d7e8d---goxejizekoworum.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/37708145756.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/32bd1d4e1496c4fe953a1e61602a2d3a/14251188587.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1d32315d404bfbef0cdd752fa0cb7e37/pibigejetirazepub.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/fobed.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/30669318569.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3c32bb48---56178488532.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/nhs2toslsflh2e5mj96j9s7md5/7231242089.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/36818115267.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/66447133562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 5072 bytes
SHA-256: 2ba9e0b0131aff3659c1b5c1710c7acb86463e0f202506e8fa4d8100f76a2040
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10048 bytes
SHA-256: 756df920bd13790adaa31f115982451b578e1a26f15ff52bd9bdba78d2d45c41
font_02_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3