Malicious PDF — malware analysis report

Static analysis result for SHA-256 7faead0f0210a8d9…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 11:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e2e03e9dd2c12dcdb2eb48665e1f87c SHA-1: 8a7579c615bc01b79c846e29d233280aeb48b4a1 SHA-256: 7faead0f0210a8d932165adc6feba64f5f4ce2110308f5fc08509036db8c2b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://teifsepahan.com/files/file/95980085258.pdf In PDF document text
    • https://jagamimpi.com/contents/files/35211597476.pdfIn PDF document text
    • https://wsbtitan.com/images/file/13217233245.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/34477179917.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb703dfd2---guxobixogodiv.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jelajaviwe.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/kugitulusizimukol.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/t3b0f1rdg3bd058cfh16tfpjs2/80762777109.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8hb3pdabsfil1sptpfdikn22bg/40128818791.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/36697012243.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/44027513687.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vixuxafukewagenu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/libidisirefas.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddd8292ca---89718730902.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/22954437205.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/12812665268.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n128sfqg8lkqqqopuk47qd467j/80932877408.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160705e24596e0---12539526042.pdfIn PDF document text
    • http://theponghop.com/upload/files/bunezugosuneman.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/betifero.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/23725733407.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/89486476105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=anemia+ferropenica+en+ni%C3%B1os+pdf+2018PDF link annotation
    • 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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 19652 bytes
SHA-256: 270ef1681cd30f2d8f8d5cdc2a3b96c7b3c84777526883dd650a529a57333608
font_02_sfnt_off00013b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B65 11328 bytes
SHA-256: ef620343708a4b169ccaa05f38dfdabf263b5337964b9b59fc0470148e9afb33