Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55c295b9b0a4fd5…

MALICIOUS

PDF

78.6 KB Created: 2021-08-17 07:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25a56b8ab859c58b547f6a7b26a15f71 SHA-1: 132a26127568c8d98234e2cbc04beb3e7be9c972 SHA-256: a55c295b9b0a4fd5e4ef9d4fc8ce02db378282191462150bbfb527e5983644d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a tactic to distribute malicious content or phish for credentials through a network of disposable or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://scpt.it/userfiles/files/vinimuse.pdf In PDF document text
    • https://shiokerbau1.com/contents//files/97084900245.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/83937705572.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j2p519m93kdpqe7ss49pqmlsd4/62837293990.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/79348470509.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/19037070913.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c9b32600---kotomibujejebarazogetuxis.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/n460m2or05lbmqodf3b207k6g2/zimisutogeroketitiweko.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdf58763c---76668868958.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9a8f0b9b---pulelekatatepolosedugute.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c952e28520b---kipokavoxawinuxofunajita.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/90042113747.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe10d68a8---77769237392.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/62351872197.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/81223835592.pdfIn PDF document text
    • https://luminex.pl/upload/file/66332093626.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610edb7531---koxoxadapaduw.pdfIn PDF document text
    • https://fasaac.org/temp//files/43919598344.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/fadex.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kiponiso.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ush57bm3hpr5qd4dp49bjug9uf/gaxenitig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=yeto+vellipoyindi+manasu+full+movie+free+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 11008 bytes
SHA-256: 3787900a95c313384be31ee55590a282dc3e4173f66e01c40782e1dc63819da3
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 17316 bytes
SHA-256: aaaf2a44665722b43df512ae1fbca8df8ecdec5f5049d0772fabad96e3a3c01e

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