Malicious PDF — malware analysis report

Static analysis result for SHA-256 855678929cfdabc4…

MALICIOUS

PDF

84.0 KB Created: 2021-08-10 05:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aaffc9707ccfb390f29998ffd3162947 SHA-1: 18f6f241bc7f4ac68101c9be94527f6735eadbb8 SHA-256: 855678929cfdabc46b4d5d823ed562cd0f231da11c2a52ee51e9e63ff647623a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a deceptive user interaction pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=how+to+setup+wireless+printing+hp+laserjet+p1102w+mac PDF link annotation
    • https://menu2uplus.com/images/file/1645599035.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/madaxesabisa.pdfIn PDF document text
    • http://ombs.ru/uploads/files/89770118642.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160916c6396cb4---gigazugomulitoxusepebofi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/girixozesewarilagaxa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/07794abaea0d7cff392a290de6cfa46a/88599552075.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/zabizolulijizepamowas.pdfIn PDF document text
    • http://novichiha.ru/pic/file/sunivubivodos.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf37bb18790---5306789359.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111a22bd960d---pujobetogokaxotaxop.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/fudov.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08f5f9fba2aaf55f6726c08d61025fa5/muximodigimijedozu.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/digulisum.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0b28c1c6580ad90e4dc50c2d6a7142e9/28155181598.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/95711149119.pdfIn PDF document text
    • https://motiv8workout.com/up/files/87946201255.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/luzeligonuluwufopo.pdfIn PDF document text
    • http://netflor.pl/upload/File/xufikebepoturelovoroki.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/odkqh0gb0rimd7appjai8ev521/59698665533.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a383c0ff1171ab366fae202eb076e52f/28902686044.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/nisodawulujenoxa.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/25371625621.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/17356508895.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2dfbaace---vuxojuze.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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 11420 bytes
SHA-256: 4f7b25fc371b71b3cd0a9818affd45ef46a27c5a3548f35a9553dbe22a034c9c
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 17652 bytes
SHA-256: 4abed35c78cf40924555b9b64a9f1d897389d51d2909e5a4b1761762b4e5104f

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