Malicious PDF — malware analysis report

Static analysis result for SHA-256 b720339b0e3669b0…

MALICIOUS

PDF

85.4 KB Created: 2021-07-17 07:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c576903507746a937938831204d8d8e SHA-1: 6547d05b944fc0992411ac62e487f50e30888657 SHA-256: b720339b0e3669b0ae3136992007eb73d5f7d52f42ceb146e0513473fbaffa92
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 the document functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which are associated with compromised CMS uploads. The document body is unreadable, suggesting it is either obfuscated or contains no meaningful text content, reinforcing the interpretation that its primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thehigh86.com/clients/13680/File/kenixulixopisobobu.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/67458096487.pdf
    • https://lapalettedesarts.fr/gestion/file/93078664595.pdf
    • https://asiarsolutions.com/userfiles/file/36949407781.pdf
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/wonugimamivitowaj.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a414c108b4---76237848053.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f64eb801d---texefajipuxarugisezoj.pdf
    • http://manavpublicschool.org/manav/userfiles/file/pavezubevakizekexamuwekex.pdf
    • https://ludifrance.fr/userfiles/file/38799297100.pdf
    • http://fly.no1-yes.com/userfiles/file/miravubereniwudu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a10ac0965b1b90ef4377994be4c70f04/zerowigoruramotukinadez.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160839c9d60ac0---88544007444.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bc76c0a8b1386dd318a72ec236cfa09c/69040621739.pdf
    • https://acavacecio.it/userfiles/files/12951513489.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc727975b6---terukudoduzegikuvimo.pdf
    • http://aquatrustfina.com/userfiles/file/wanababo.pdf
    • http://cbwmd.com/uploads/Files/47768489566.pdf
    • http://evpltravel.com/xv_image/file/57776061545.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7rgahmgkr2jiue070soprdh3q0/suwavo.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/7ea5449143d705463319f79c0fc0b306/vakebijuvikepekufokadeka.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521100723123997.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q9805n44ggk3v02l5a7klg4c4k/96958832819.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cd6e281fc---84318770584.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73380525848.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+zombies+ate+my+neighbors
    • 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_off0000e8a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 16792 bytes
font_01_sfnt_off000100b3.bin
79a1dcb77ca6c268642dd158ef6c47c186c3be4ab741740e34faa148e4b5d882
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 17772 bytes
font_02_sfnt_off00012fb5.bin
ec3e7495f5b58e0f72e4625d6b12b1478a042e12c9848a2ebdaf90f3ff9ab8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 10784 bytes