Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5824b748fa9470d…

MALICIOUS

PDF

91.9 KB Created: 2021-06-30 18:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fef35491a816785ff5a0e786c9c1c2e6 SHA-1: c86c23c464089d35908e02e882d140a05b35c751 SHA-256: a5824b748fa9470d1d744c400df857c28d961283e6c6671570d60f6a60097db3
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting and redirectors, common in phishing and malware distribution schemes.

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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5379a5380e14ff7746835bc2b827aa25/40288111798.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ae43ab23ff830d39c400faa11286599d/tumadijazeb.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e526a0958---54716271146.pdfIn PDF document text
    • http://www.520amis.com/upload/files/98822682815.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff51eba14d---59842271101.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc46cac20d---39853522588.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5b498992c71c511cfe63ae271bdf82c3/kegamole.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/radetazawekeruzuruwijuzeb.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcc288d5d---4225344578.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/23080215764.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k8netd2ouhc82v9bjr91khg8q8/30930901099.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3af1c98f5---fepomajuzagi.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4j94qhca1j6igi4k3p0e60b245/41432031845.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/jevolanipeso.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e9a80ac8---bivodusu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/04ujlgcor6rff6hm6vfu52oom7/pubikirudef.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///fimabeberijumerikuwib.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477eda05b---4544864400.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ritmg1r2tivau3d8m4gv1trdsc/29473052519.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fujotusenudux.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f12bdac6---92503401232.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8a6sfttbhgb30u8qkq16j0etoa/87343112192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+can+travel+around+the+world+while+staying+at+a+cornerPDF 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_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 11008 bytes
SHA-256: d7b5ac4937bb1d0bb2b59487d7258454781c2e4d1a94e71ba3feeb9ffdd1ef61
font_01_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345A 17384 bytes
SHA-256: 6bc8a491ef080c86e9418fc8fc17826426b4758e838cc71f9bc07119fe44a5d4

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