Malicious PDF — malware analysis report

Static analysis result for SHA-256 19768ea638d44807…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 01:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3e57467e0aba9079b20c13db5d26f48 SHA-1: 2b8d6386c01ceeb721ef305af7faa90f98d1ffeb SHA-256: 19768ea638d44807159163ace283d088c7a65555e21b3d6c35abfe8ba55a3d39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://theurbanthinktank.com/files/42093557180.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1994207b17adfe5225177a9b062737a/dozusivururudakike.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/zopidobavuxomusezobu.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/vopevika.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051419301240.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/91343042823.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/75481171230.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/87412690177.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/63535118450.pdfIn PDF document text
    • https://fasaac.org/temp//files/9161057318.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610861613bb88---16497683623.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609414423ed2a---30822312387.pdfIn PDF document text
    • https://areicon.com/images/file/rixas.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fb7cf0ec---kegadezugefiletifi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/dudinijis.pdfIn PDF document text
    • http://kag.fr/userfiles/file/49910341243.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160751da072a00---dunipitepovimut.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092016801f44---2126855914.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4767ea85d5db8b94ed28e7ad091fd448/wukiwer.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/32685577688.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/kokelubaxaji.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabd6eab38---40416816434.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/xenegekabozarowasu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/47409391358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sepa+lastschriftmandat+kfz+steuer+pdf+th%C3%BCringenPDF link annotation
    • http://irodori.kir.jp/files/file/zezadojavabifugavejibuj.pdfIn PDF document text
    • 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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 18448 bytes
SHA-256: c1a3d8f7cdc7b6969ee83f9791c72a9828d91f8a2685c7c60104a9443c45f466
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 11468 bytes
SHA-256: 574bb412a59695c803c18ce9020415d19900c45c19918165a8f1f2a71c401078
font_02_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1