Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f177364b82120e…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 13:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce24c2da4e5e58a35c554b970df5e469 SHA-1: 2b702e055997046491091c8effe4d8199a9132f4 SHA-256: b3f177364b82120e3f20564df7e874aa7a528fb1ea9ae914ab6a35c767a86622
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, many of which are hosted on WordPress installations. These URLs are structured as a link farm, suggesting an attempt to lure users to malicious sites for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5e8dfef12710e38a2b950c6573e9a5f1/36606435360.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2jcckahq3l08ecut4o7fojkem3/gonakapuxawefu.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa286747e722cd18389a388537ec6129/kafepavefilanulifosivo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/69689ad02178de5ca7e1d30a5fe76af4/4846950310.pdf
    • http://archinfo.ru/uploads/file/97061646165.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40d145c8c---30109754643.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a65af1466a4---51279228150.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2lk4hehmtaa2a97ldruqcith6d/36344082567.pdf
    • https://andrejc.si/files/file/kekerewopomiwoxubowupipu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085737d58ac8---34465152318.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c614f6e7b9f---resojonuxanar.pdf
    • http://adabaskimerkezi.com/upload/file/27622750648.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/63407798866.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l3vcdfpttqo7a3u5q3eangorn7/safagoridakijuduxitaxuta.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d7a062fc---31196797108.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9237a5c8---rukibadupidupijivimujeded.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d00f95fd4---zilefixemazuwezuz.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9cd0e3eccc1fd29397d3929ee563e501/65061556835.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8e22db61---55146601096.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9171e854ed0d5cadc1fd612cdd6b36ee/45520339275.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=most+important+part+of+your+body
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/406cf6711d8256e8ac45cd028c9fe3ce/zakuxas.pdf
    • 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_off0000fdbb.bin
ae1cd9ba17d0df308016db074046eeb259d572e8a5985dc4ffc9c5b91e1e0b10
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10828 bytes
font_01_sfnt_off0001167e.bin
4ba89471b0f01f2aa7b7ccf95743d5964fa4e8657a91c8187e118252c4982687
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 16700 bytes
font_02_sfnt_off000141f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 16792 bytes