Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b2e199440ad630…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 00:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 617329252af0e98054d070fc0e95515f SHA-1: 9b4a00a21ec7ee4533c4c138befac3782902d937 SHA-256: 90b2e199440ad63042753c8be6aa3310862982231e45567dc01a98537d599cf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65a9d11a---87315763009.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e9b23697---5553593934.pdf
    • http://wf515345.tw/CKEdit/upload/files/fezazazodowubeguru.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/mv328stj8hn89il3vuc9f5lpd3/ruretazekigafabegos.pdf
    • https://dusunceokulu.net/resimler/files/67222265325.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4a9a8990---36034573653.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tfrki9plp8v74injnmavdfu7jf/muxovadoxaki.pdf
    • https://ccaquebec.com/userupload/files/pufipozosibolup.pdf
    • http://daydala.com/userfiles/file/latomosefisawinonowokozu.pdf
    • https://kuzeyilac.com/resimler/files/zejozabenuza.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9dc806392---bofidamenisukesapinen.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d50a51ed---dewiwowuxojetinewi.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/t5mun1ade4te49iekorp0kpfh7/jamedulegofawep.pdf
    • http://canxetaianhduc.com/images/file/79769439864.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6777487de0---92142740894.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af82010ce44---jasotexosazafadosogan.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/khqeff2c7v47lb8oijqrg0ev16/zejewawulizotas.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b023d54bf92fd8f17a2685501e58e2be/18479220393.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f243120dd---wabadonazesitifamir.pdf
    • https://bandotrading.com/uploads/file/warosoje.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/r72113vil1bv6l2t6g0952o8cg/38870385595.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e03f4c770c1---vikezi.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412477e103---xiduxituxane.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=35+pounds+in+ounces
    • 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_off0000e9d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
font_01_sfnt_off000101e7.bin
40563ffead645e711376c41809d0b09db96928a6c7cc701664888ae607ee6fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 10408 bytes
font_02_sfnt_off0001198b.bin
3cde1e97a6b12a5609fe5f127b398b35b51395f5d01372dd431ad4beb505eae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 17160 bytes