Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c017b3429441f89…

MALICIOUS

PDF

86.7 KB Created: 2021-06-24 14:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56162652d040107948c965ba15ca1576 SHA-1: 7c101f1e2a71729caa496a06b6a05ea45e252794 SHA-256: 0c017b3429441f892a1ad4d438b8de5bd5b1b4db9f5c036ef9577cadabd0be5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://congchung7.com/upload/file/34028450390.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b217e0aa0---88104973698.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0a9cced7---41084094224.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4b9si38l6pk4325mfq4oouf86/86182627242.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fhka1efrhet455r5tp50dhe3c6/radodixurunolavojotewogi.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b312af35831---binokolukogamekukunolu.pdf
    • https://samowar.ch/upload/file/89892271443.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0177398f9b9d168f8af2e02740de179c/59804583704.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/nudebegu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160908258375dc---gofasisidilukikoxududigo.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5292346f004eedc24e84c6b582bf84db/pusavusefuvojemigumuki.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8f62e28b89---moxidegutagenawuwo.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210527_743AD550B3E56F81.pdf
    • https://peilimineko.com/userfiles/file/90205058451.pdf
    • https://canionglobal.com/FCKeditor/file/zizaf.pdf
    • https://egyptsuntours.com/userfiles/files/46737316722.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/vitapiwobazinivibalaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=qualitative+method+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011779.bin
2f25f0d9715c98e3eed165af12c132434b97b4c4afbeff53dd887d44152f2b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 5128 bytes
font_01_sfnt_off000128cd.bin
31ad2822f3bd6586301dd3a2a1d8f29c354b91987ed3ad125ae626c39ec461f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128CD 11156 bytes

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