Malicious PDF — malware analysis report

Static analysis result for SHA-256 665e04279009e703…

MALICIOUS

PDF

74.9 KB Created: 2021-06-12 11:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9d9f22c975e3ff0f65854470e488b633 SHA-1: f57cfa630c6502e8af5893d2776b4539c20c2583 SHA-256: 665e04279009e7031e897a78b60aeda9d41cbb85da29a5379297f0b0c19cec4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to lure users to malicious content. The presence of these links indicates an attempt to deliver phishing lures or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://infrive.ru/uplcv?utm_term=pdf+squeezer+mac+free PDF link annotation
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/49bdf513a5bb17e555c25771ce712b72/zutixuditedorum.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9af4a4811---ropobi.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/41764299313.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9cb6b4cbe0e96fb0468941bc7dca8359/38652609612.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8bb07fdf0a8bbc49dabfc54427a7db81/95713800964.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/91e59bb174ca2c74cbc7128825ffdd0c/23041671954.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/fugujasarugagasifeno.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/vitesodusumixadu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcccdc82d3---babap.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/41467655398.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a6bcd045---kagulakaf.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a04c0ea88d8---68857216526.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0febc65864---gozunumuledabakigeronejar.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f53f0086d---40838294788.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fapufexuluxotelexu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/04a5c689ffde6db2768ff17fa9175386/bigenulaxekakositebogatan.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wapibewukabekudubanete.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/68829054616.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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5312 bytes
SHA-256: e0b3ad75845151b7eb67352ffe7d4d983af77039a978f23fe1110d7ceacc6544
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10896 bytes
SHA-256: 654f49314d6e98d79d65d1c63b865b8ed618849df84f071c4fda93a5c01b9635