Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f2ef46438fd45f…

MALICIOUS

PDF

94.2 KB Created: 2021-07-01 20:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9db820217d89b3166c0f9822e9fb081d SHA-1: 3f2bd74b8a14611d088529dd448e4506b303976e SHA-256: 87f2ef46438fd45f38e1a2943659fb13a9768997c47e58f023f34a075ced4dca
164 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to multiple external websites. Several of these links point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • 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://mediaworld.pro/ckfinder/userfiles/files/89011161752.pdf In PDF document text
    • http://bahattinburyan.com/userfiles/file/66276538619.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fc5e9f69---35786129261.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4efd0ce92a095f4c5c3cb8b0caf8db64/joridetebegufaf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1de1d185---81078842977.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bubejeke.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097546c61c40---33578424290.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/pasokumo.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/fexabibasotalo.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/sares.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/gakej.pdfIn PDF document text
    • http://imaginove.eu/data/Files/62883162622.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860afd0b57---80361629367.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ff1bc74---1820915370.pdfIn PDF document text
    • https://codecs.roimages/file/61955575465.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/vazilomapopizotudad.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f3c3f6d46efe7e0cc56f851192036fc2/19613353627.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e59805ba---legudejavibepate.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078db8092309---28090815825.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/laxoluloni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420d259ac2---renomofesovone.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d9d09513---98063407485.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lizijesunukodufare.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/79104604762.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7fe885e9---runazigesotug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+does+sexual+reproduction+occur+in+fungiPDF 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_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 11076 bytes
SHA-256: 5465db605a76247d546cdb9ccc82565e09eaee2399db0740ba5bf7fe3923d28a
font_01_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 17660 bytes
SHA-256: 73cf7863285fe761e5a74c039192eff14b9b1383f90903dc6c2a31253cf65bfe
font_02_sfnt_off00015325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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