Malicious PDF — malware analysis report

Static analysis result for SHA-256 1717dbc22c19708a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 03:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bda41c3988d7cba6d684a9c9fecc6db9 SHA-1: d9588d128913f3d928a7a4a382757a2fe0be3ca2 SHA-256: 1717dbc22c19708ade2686a01893422b325ea222bdcd53c208330d9e7c8144f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated and does not provide direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://agataklimowska.pl/userfiles/file/gaxorer.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1f5ed0b520d5cddb0d6cf870e58282fc/80071644206.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37aef2364f---jikidapuker.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0760c722---natoponoruzoluvibogot.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/8497740415.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f74f2cb0---19956764504.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jamuvurelubexoxenonevekop.pdfIn PDF document text
    • https://educhina.mn/editor/files/5599943694.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e851c4531---92639608380.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/73476296890.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/13598465775.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/zegemovumeguwalogabujuvaj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ab322246b---durakusad.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071be9b7dd6c---mejefumonixuxolejorawo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bec1969a722---pakopomekuwakusebat.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/694l6chbagmlurkbjodn5ghnq6/12319024830.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8834f259f---tavelozeforaweju.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/mobaj.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/87311176163.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/janufi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/adbabcf713e9138caec25ea66af09d73/seveligetirizuvejalop.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/50557806113.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/woputikakot.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/naxebariwezunotawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mitoloji+ve+ikonografi+1+ders+notlar%C4%B1PDF 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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 19548 bytes
SHA-256: d6e041171ffd580ecb6d4e428cef631d768f5ea2bde6fbe91d2bcef6187ef96c
font_01_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 10908 bytes
SHA-256: e0a16023d78cc820709096254801f0dbf45d25a26bba73a7991639fc9b317345
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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