Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c58409e25e3054…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 18:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32a9796342e7cc1b8491e2de82b90fb SHA-1: 43990404fef2087440759da08cba877d86eac574 SHA-256: 17c58409e25e30547d5b0723fddaf7a9efb4dd159897663d92cdf16c4fc5f018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160702e93a7b4b---76658634781.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7914c76f5c---dezinexuli.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ed647639fc026a774bba0c9d87bdf2ad/28969953020.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/g5khrv61mpjpln2opn1vf2ooeb/kosisutipizetu.pdf
    • https://bravo-hk.com/userfiles/file/44177103100.pdf
    • http://industrialdevices.in/uploads/xuforenukeginagudepakib.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c5688731---92026292037.pdf
    • http://pspectr.ru/userfiles/file/rakuvonopuba.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4d98960f---xelobafemeza.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80f014afd---dabasizujugarakina.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/05125ff0dfda3174e5e93306ae897fec/3354843994.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/4355144526.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/l0oh0gpf8omjec3uftdt1lusgf/pipuxixisosivaxizo.pdf
    • https://krassimirtaskov.com/userfiles/files/mibavonodumimokas.pdf
    • http://madmojo.com/fckupload/file/tasopamebolufo.pdf
    • http://scbczy.cn/up_files/file/20210624_142109.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/32150ed1c04b7ce97472ffd93d21dd09/xepuwasefikamileka.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc68115209---68291983900.pdf
    • https://asi-filter.pl/files/file/21174919203.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/84380966985.pdf
    • http://cappellastudio.it/userfiles/files/wifozovenumoxurolawazugo.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607620f26a536---92796543671.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+often+to+change+manual+transmission+fluid
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 16792 bytes
font_01_sfnt_off00010943.bin
9b05beb8efa45aab14498f7c52332335a72dd8737c87ec2caae45eb40dde8348
pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 16660 bytes
font_02_sfnt_off0001349c.bin
e2f23eb0aaf8125959478c95598048fe97102eaeb073d988466911d795d92db1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 11100 bytes