Malicious PDF — malware analysis report

Static analysis result for SHA-256 76679960dde8775a…

MALICIOUS

PDF

93.7 KB Created: 2021-09-05 11:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a95555320b5521ddb7f3a234283514b7 SHA-1: 973a0ebaba113c0072f1c04a791aaebd662f0c21 SHA-256: 76679960dde8775a1a932cff2ea439d092fc0c23923d8ed720ba3855c532e85d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to compromised WordPress sites and other domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://queure.ru/uplcv?utm_term=rolleiflex+automat+mx+manual PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a996d4eec59---75163652820.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/82801418259.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/morekuremoloj.pdfIn PDF document text
    • http://sartor.ru/upload/files/13560334455.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/94611635476.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087238074b6d---nojux.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0dfd0ff5a---pezujitog.pdfIn PDF document text
    • http://mlead.net/images/e/file/nutukunakovilugabe.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/jafunuxo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/havmfij09g66idu1fvu81lipd4/zufazurusi.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/15044655559.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/o6m7shkpa4laoniqggk95bumvq/54242200745.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/semotexumivosezujatono.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5238a3c7---lerozojoni.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/38972176578.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/573b158247adda33e02d3b787be88f03/patedopomonubudateb.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/tomanizidoredulaf.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b419afc5---kafijetodejerose.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/753f3ac0bb3d2b29a4410044e0a164c8/89392104637.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eec96f0d0---rapinigusexugufijagezet.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bf15c02d5ae16ce09a7966aac12fc299/xajetalopej.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/38118991217.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/906fc018cc56e7405130b38c8cb00e41/puvadobugusolug.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_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 18424 bytes
SHA-256: c5d573a12b2c55b96f7e35ea432eb4c62df1ead50339338fdc17271b3de06c57
font_02_sfnt_off00015195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15195 10356 bytes
SHA-256: 25015f9be481ef7abe94d7fa3fbf0304bc52b6b7dc97a12f939983d4dfd27886

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