Malicious PDF — malware analysis report

Static analysis result for SHA-256 4217f2ab35aa96f8…

MALICIOUS

PDF

180.3 KB Created: 2021-07-04 23:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a73312e635805202498c8c8ee626fe2 SHA-1: 8be95ad0aed359a918601ff2843930d834f7357f SHA-256: 4217f2ab35aa96f8d4f967c5f97f127cc09e420c68f4e764edbe98403fd49fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608a588696639---tinugimobuwewekonubuki.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/14f77749814b86731ac50ea544f56e34/55928617525.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/livepaw.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e6e3bfab16055f51290109a380a9389b/58570486297.pdf
    • https://alihuata.com/userfiles/file/71395236540.pdf
    • http://susasoft.com/upload/userfiles/files/nagozevufizo.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eecf09458---12836032777.pdf
    • https://juvelyrikoscentras.lt/Files/file/jozusuwuzuvu.pdf
    • https://ascinfratech.com/clientprojects/trading/file/44805581041.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ebce53f6f46aee8559a2fb56ff2797c3/wumomopurinixemumafexip.pdf
    • http://nuraski.pl/wsg/userfiles/86643402874.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6292707e---11858796646.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0ef953e6d8e0a67d22875f55e0437db2/losijerurogoki.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba67477226---15286369936.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/p1egkgm3ccnkq6kmcrpb6roshk/73828369436.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c06644de3---31101698445.pdf
    • https://blindnow.com/userfiles/file/76917105380.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/k677v288dmummk8gb4fqshs2a0/pukugovekodifireju.pdf
    • http://alituncer.com/userfiles/file/seruwawavu.pdf
    • https://bednidhitraders.com/userfiles/file/68663097161.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/27636120791.pdf
    • http://mppscstudy.com/admin/usercontent/file/2546048452.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d57b35b181f---saguvekip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+harry+potter+wand+at+home
    • 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_off0002653b.bin
8e4de45d22d44da4e9795fa503c325b52f7fd2ef8176e9fbfc4613ae8e34ba29
pdf-font-stream PDF embedded font (sfnt) at offset 0x2653B 10636 bytes
font_01_sfnt_off00027d60.bin
85fdd1f300be0bab9fef7766219fb210f379d0167dc16e97515456af21b3fa49
pdf-font-stream PDF embedded font (sfnt) at offset 0x27D60 17724 bytes
font_02_sfnt_off0002ab98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AB98 16792 bytes