Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38cc563a0b00a2d…

MALICIOUS

PDF

135.3 KB Created: 2021-09-07 02:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96167be93102075e287cac9ce00081ad SHA-1: 70c4fe548866639bc741c384b406b6ff7045364b SHA-256: c38cc563a0b00a2d97a9e16bbe9cbb70a5ba300fbf7186a0ae4fe359b394433b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware. The heuristic 'SE_INVOICE_LURE' indicates the document's content is intended to deceive users into clicking these links, likely to download a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16127588f4f1ae---893192893.pdf In PDF document text
    • http://www.gesas.it/media/mailinglist/file/59745710454.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807ab80b7c6---36373888921.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc2b4335e---59821735021.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/83235333344.pdfIn PDF document text
    • https://davaocarrental.com/images/file/7809988466.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c510545aabe---64950331943.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a8a398617a530d8b1fda75976c32ade7/juxixalobuwudabitemok.pdfIn PDF document text
    • https://quaint-house.com/lavimekebarili.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/kakew.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077c20b2f7f8---38051022662.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/gopalaxasur.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/31575690799.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b271dd0fdaf---pomowesufojin.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210809104708.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dcb2ce217---tizozamodoxez.pdfPDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/614bec43488ac6d0e17fcc2b08101b66/wawatogudidudelapexu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c591373dc1f---71605299160.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/kadukokusoguxa.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a4f8c9799ac373d07a81be30a2975e56/77068262329.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca95034d67---sesasepatabinakifigig.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/58480173307.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160781a5893905---xagubuvuboxolij.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/bofepipo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c48ea8718---26105978217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=inland+revenue+tax+calculation+worksheetPDF 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_off0001abae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3C5 10864 bytes
SHA-256: 11356eeb7e8accedd89d39d202bfea8a517eb5f738cad002347047738a0d8b9b
font_02_sfnt_off0001dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCDA 19320 bytes
SHA-256: f6a6bd66724e78906bda6bbd4f603bf11bda4e3ca8799bf8a2750af57f4ead49

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