Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aea1bb11f5f762…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 14:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 91dbff839b6d2baecf8171933291d6c8 SHA-1: 3cb8986409de6cadb7bda28c4edb6d37586ab22b SHA-256: 50aea1bb11f5f7628ebbb365032399c1b5f52e4aeb5660f77a72d0ad2f7a1a06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into believing it's an invoice or payment request, likely to encourage clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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 https://mk-sito.it/uploads/file/94327620596.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mmlloudul7mprfnd4ldg7u12j7/kisogutivolegogoxop.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3268cc2f91b31610ced31a3e16bd457e/69928743305.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/fawexoboxejosakeluve.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/56594839218.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ab4e2368---78550641860.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c298cfe2f90---10571695246.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5520121829---kibejuwanazujimuvizimuzep.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5b93bb13438ee69857216fb951d8823b/dinega.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/kvf27e3tc5ut762tt7sk0fv2gh/20867030371.pdfIn PDF document text
    • https://visualarchive.bg/files/gugegezamo.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/vokatanazakonovevotaredev.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/nerorodiz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb919b5ae00---52928123240.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d34ttsfi9r6f11qs1oiiqr6m01/12334440628.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128df6c47b---39073938215.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ecfa3e4f---saxiragiboxamolaruje.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/zowifojekexekavekoko.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mujusilavipova.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/41647378086.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/48995523846.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/tadebu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/8944646312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+activity+based+costingPDF 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_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16784 bytes
SHA-256: 2a276917799fb58b19ca2bae83382e03ee977433216db4d26f9aab774ea24d21
font_01_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 10932 bytes
SHA-256: 743ad0759f444fd071ac7f9e86b7568286804341031f7bb8a7bc76ec42687ee5
font_02_sfnt_off00013798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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