Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb10e83d180f7304…

MALICIOUS

PDF

109.7 KB Created: 2021-07-09 18:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be5bb5f2e0475486c6b2e88f669267d SHA-1: fda036101098019ae7ebd4030b942d9f6645f771 SHA-256: cb10e83d180f73042fefe6b1e68d6b4085db8f9b32aaa7538cabac1e7ed05099
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated content rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d338e7b9c3---nozuwegogesu.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/22510302832.pdf
    • https://honghow.com/ckfinder/userfiles/files/39089933018.pdf
    • http://onlineexpert.in/userfiles/file/tetarenulekipelafolifejeb.pdf
    • https://btcauction.vn/hinhanh/file/lavoresigakivusutakozimi.pdf
    • http://prestopc.it/upload/file/37142771318.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b70e8e325c3---vibaf.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42af04152---madinovoxanuwejanomosed.pdf
    • http://all-pass.com/folder/editor/file/vumajemurukajudipine.pdf
    • http://chatfieldfarms101.com/userimages/sapatepiwuji.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/9181422885.pdf
    • http://vititanon.com/user_img/files/62421759419.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6f2lfsl69sha39csvrm5q4ob8s/sawibosaloxonelexilaj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1b80ecad---24552746143.pdf
    • http://austria-ex.com/images/blog//file/wapetakebimi.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/29158d8bb5a56450df7f8c5ad920dd68/98781514569.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27e534ee8---tubujipixebaraguzu.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0j9qtcp2nn9v7c8p5ja0oum3l2/lawuvugi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4036568ac---mibipivesugupoxatadatim.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075991b393f5---zasewaro.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8db636add1b9ec26be894c66f74e5299/mefuworonewokolunudinedam.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964a582f65d---97606986015.pdf
    • http://debden.org/userfiles/file/67465582594.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0fb584a59d2e085e446757065a95f090/kawakakoxixomeliximigot.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956645551f---59491396483.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a61a0cdfecc0892703a49bc493ed9c27/62906693512.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=church+of+the+intercession+on+the+nerl
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 16792 bytes
font_01_sfnt_off000149a9.bin
675f797caaa78f513c56ee97bd411f464f83f3a612447bc22ebb043804a6c6a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x149A9 10400 bytes
font_02_sfnt_off0001612c.bin
64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
pdf-font-stream PDF embedded font (sfnt) at offset 0x1612C 16060 bytes
font_03_sfnt_off0001763d.bin
900818e024d09278dd56473d7d478e70532247b36b904dfb728afaded0d23bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1763D 19900 bytes