Malicious PDF — malware analysis report

Static analysis result for SHA-256 392e18613a098ca6…

MALICIOUS

PDF

137.5 KB Created: 2021-08-22 03:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b2424265b81a05a6998e2f6ee7cdf80 SHA-1: 9fae580d95fcaa4fed39a2b58825befe7d2bdc4b SHA-256: 392e18613a098ca699c4e122dac61524b6b4859caf0528c3c52838ce15356e90
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://gps-tw.com/CKEdit/upload/files/kiluvexumapitavuxi.pdf In PDF document text
    • http://grawerlik.pl/userfiles/file/mozusapujakajanofirukoru.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/29522214101.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac005bec504---67525030463.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s14v9pbeppmtuicr1lqjgi5pn4/11047542619.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/jolikurukujilujepi.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/tatopeve.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210710_145154.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kufinatemisut.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5c0bb599e3786ab5f423ff3b5dfdd221/zelumizadenejag.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/fenosafi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/li225o4jbj0o9nb79hk9hfna6f/jezenevizuwasaras.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073f90ede6a4---boxesepijijufo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/149bd315d27306b26fb1e58492686a1c/fimilug.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/rufasofelenewoni.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/vorajivolajefixud.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50719c9b2d---gokejosovemoluvib.pdfIn PDF document text
    • https://ebooksweb.net/files/file/41195966585.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6427de58bc002954a8ff2c7c28d82db7/94796074736.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/21232584749.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d6b90a78---19367024393.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/kebopigevudi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e81c0c8d---23042803628.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2f514726a832b104f3f786e87e02e99b/41071641830.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/worifojujasirotene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+pair+yas+207PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8CF 10444 bytes
SHA-256: 47967496ffc05f847e7c7e7885c8e764143c3a4eba06f0056242c55cd3274f2f
font_01_sfnt_off0001d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C4 17768 bytes
SHA-256: 55bdee86b13156c21aef41fa7fb3988d8bf02f17d473cbb475ea8bfacb8469c4
font_02_sfnt_off0001ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1