Malicious PDF — malware analysis report

Static analysis result for SHA-256 927d4ef4a253dbe3…

MALICIOUS

PDF

81.5 KB Created: 2021-06-09 23:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 054b42a2f6cd664a0a3663fa27429304 SHA-1: b36c22788c9ca366fa99f7a32901e755b2f3f410 SHA-256: 927d4ef4a253dbe308d52e563f743cffb25f2fc5dd92d9cafa67c2482a093d1b
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 0.9996

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://drafthe.ru/uplcv?utm_term=roblox+apk+mod+unlimited+money PDF link annotation
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/553515e830a02a66cbb598741b3fc082/dinofafekerexuvozove.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/dugodovawijifovaforax.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609849a48a562---77556488772.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/67069793826.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/tuzeguwizuliwazagar.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/27593805551.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/34643147115.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8246b8b4b69fd135825f7d372cf9b80a/wogax.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d65c2e9a4070fe2efc1154289da6ddc1/64864118367.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a18f58b19---bujetiterepigotesawexu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/nibimikudaga.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0k7u735srfc2u686ku1u11btv1/saxusonizojigokuwe.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/piqthi3mmeakq79t8j75gegml4/zatome.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/23471064014.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bdfbb3e5a03a5b17408e9e3b8061423b/45486888005.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3acr4mdp49llk2igpt2kfkop0/71629752970.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 5096 bytes
SHA-256: abffffeff2132c70286e7b9980437b83d08f5702edae03c174020c75b31a9235
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 2268 bytes
SHA-256: ad6b7d89c5fa709855afe00301495b63a95e2ac7f715e2abd2fcaf396ca2e5f3
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11328 bytes
SHA-256: 9bd631947a849524a9fbd02468f2c148815bf74c691406e31cc5e6bfc1f4f956
font_03_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3