Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0a4c7c66863182…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 12:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ada8e5162fa778260e11ea31494bbf4 SHA-1: 7c9c32805d2a405a7881e3aecad07aa9c2ff9c81 SHA-256: 3a0a4c7c6686318252bd32630bfc1c849787a7dc904021706a4d88bd50057a09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of multiple compromised upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/25e269de427bcd150291d60a5fed7b75/laxizinofosexufoziturofu.pdf In PDF document text
    • http://hydrogears.com/survey/userfiles/files/buwavoritujap.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/i3fqtt8vog947n5l19okmvvhjo/somikitawenejedizudepevu.pdfIn PDF document text
    • https://somogyplusz.hu/files/58315885620.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/95313426196.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/7101730779.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/32652542888.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/506cb18df9370d576183afde24889da2/savurusodomit.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/sasejine.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vijamexomenusud.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959c336576d---15151772321.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/10372411093.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i9sb03tlnplv9qu56mu6gbbc95/71893368788.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/de0c1b1a915018e49b1cfaab136e07d0/jugikixuvupazakij.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/21039436368.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wivid.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f5b94694b5cb3cbce6a1f28702d7e746/zamoviw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hupaqmcn6rfpdci8td3obre6cl/22081059591.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/sitobemepekebutogenaf.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2c315e52c91082cb8b1201ab4c2f6763/kamen.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/65283079440.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/soraratanufikuvurufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tn+forest+watcher+syllabus+in+tamil+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 20732 bytes
SHA-256: b1f38e2de7c74bd2ee371d8b44b82e608f64c9c0db703f561fe13781280126ed
font_01_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 11288 bytes
SHA-256: b9deb156df33a82f913cd8a3da92c9278887f311f1540cd517c79086d56a9e8b
font_02_sfnt_off00014fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.