Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04513e5b61151ce…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 06:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 522eb7390f756bbd9c1d9ce7c8a088a4 SHA-1: 3efa068155930d4cc274267f31c8a226a234b2c3 SHA-256: e04513e5b61151cecf16de63b345ab00d49162da2fc7c13647eb8fae8dfc5811
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 numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and link farm structure strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+add+signature+stamp+in+pdf PDF link annotation
    • https://izr.fr/files/35136501919.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/63746775374.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/sareroduxul.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155b34784ad3---44043815735.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/91312887511.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109092248596869.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/64914583349.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/vovapiki.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f454c77c4---70066695860.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/66931178213.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/6515896350.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2d773319f1761058065e5fc0b88c0967/kixubifi.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/1091999537.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/44798624115.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/wapesere.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/fufonutosozo.pdfIn PDF document text
    • https://proxus.nl/file/48500552602.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/29321925649.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xazelejesakewuxo.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/54773413404.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/69528555565.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/dujawazejegokotuzew.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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 10972 bytes
SHA-256: 4ab95aac678d90714ee53f08c79c4e38ba72642a1d1ed76cc4891dab83770212
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 17388 bytes
SHA-256: 1e28866016d7178ef905edcf29416236719021ac9adcbaaafed5ea5e45bad210