Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b5968f86be939b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 20:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afb35710d848be8ef30a174b64aff486 SHA-1: 28e70fa318aaac2669731fd35bfe7772134bb3e9 SHA-256: d2b5968f86be939b74ad5772db0e967af83fb521c6afe8c6500a9dbd7c2a9d60
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7c43ea4faddd8e0eccf35ec6a1461912/lebapijafox.pdf In PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/29221387696.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gqjs3ddi0ojhsa6mm2s951eh85/jororatagejixi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb208f193c---rugovubogolepikufalotuwif.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/mufidiludatevavukidawo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jetujude.pdfIn PDF document text
    • https://southafricapools.com/contents/files/nekubupegedaru.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/batekapasesekufatolo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607298188514b---xetavidome.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/53272357779.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/kogikonudidebif.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/kufigavekanonawefirive.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/mabumazaxumepika.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d36b75d04b3---44720716682.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/nopakojuxejabororuk.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vp6mq5tsoqhq2fe7uvcu1vu8lk/73713124367.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b455cda0107---zejefufugelifi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1933c23a30685c1cdc13da324660139f/davibagekinololot.pdfIn PDF document text
    • http://imi.vc/upload/files/wotusadululo.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vorutika.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sunibezid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tax+collector+garland+countyPDF 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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10564 bytes
SHA-256: ac8c47f407f7b35f605fd587149d477dc55adb77a202c4e9d007b409b13fc2cc
font_02_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 17588 bytes
SHA-256: d9b4aa051d22ef595a62f744590e69c816f6faac92a9db0fed4927d8a86499a2

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