Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a06e3481c89bf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 19:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e86934c1616da75896a2cd7d7dd4fcb9 SHA-1: 01df0848b31a90f83f5bbd8cf3ce8bc7eb9fd482 SHA-256: f04a06e3481c89bfdf30332da83b31dbb381a2e61edb29129340ffb4b0d9aa09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, likely to distribute further payloads or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1a2a336d---retarubotizudixosebezav.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613295245f93b---toxefovedigonawobov.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/70939657661381a5125d54.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/67520448939.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/74397867096.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813b3c3bfb---36971114943.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/40741553810.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/19842148475.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/dujakixujidorag.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161354fc78108f---wefibajanufa.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/80185942077.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/midilixigakawuz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/piwilukekofevenarotituk.pdfIn PDF document text
    • https://shinaltd.ru/images/file/29105886967.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/70160482329.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/76305446945.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/biwesepejapur.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gufodexudunuluj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305b77a294a---gulolegopigebafekozemiju.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/sukinofibol.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ueeq96h5n44aldqqsfcg8qu726/fomat.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/vadukomafigiba.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/72960485971.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/keduguwisomanovakoxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=batch+apk+installerPDF 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_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 10496 bytes
SHA-256: 8caf182fd9171cccaf2c7cb62b072e71b5b3aab52c098c49cdf919f927aec348
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 18236 bytes
SHA-256: 665c128307813055daedc173dbc2ca07361dc8b52d789763aeefe1c186e1f1fe

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