Malicious PDF — malware analysis report

Static analysis result for SHA-256 f935b90f837ac817…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 03:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa9955ec0c88f9cf335afff9c3e7fc60 SHA-1: 386054dac19a74aeb0603cf2b846df288d99c9e1 SHA-256: f935b90f837ac81777de80d9895219ae01d96e6341773dbc20fdb504f4d0fe47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious or compromised websites, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://jar-ted.pl/file/99248085163.pdf In PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/46251969260.pdfIn PDF document text
    • http://willbramephotography.com/fezipiwarukanifuf.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a1511e706---pusewowagopetudelifosami.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/61928016458.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/27802687277.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/96075699219.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078982d7912c---43811876705.pdfIn PDF document text
    • http://aimic.com/userfiles/file/52396502310.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/xolarusazunimetumox.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/fasepipudosaz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160759da720ca2---68561130671.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zadawenapavibipo.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/godozawibe.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/4970223909.pdfIn PDF document text
    • http://xsteelstock.com/d/files/nowafekon.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/tuxegogoxiroraz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6dc987c0---puludadifuxasuxun.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0e0e0d775---gababafito.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/genusi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fm0c1f2t7c9bjg70o6d19ml4r3/tujapowomonifazawimelur.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/jivugewunu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4636dfad4---pewufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=villa+of+mysteries+paintingPDF 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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 18684 bytes
SHA-256: 1d91cf9fed5f63d52ca14967266f4754b0ebf8c4ae61287cdc2bdaa3707404ae
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10784 bytes
SHA-256: c33133d1786facf5b63cc8facf32d0784b9ada9d9697959bb553c42cd6cc9257
font_02_sfnt_off00013798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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