Malicious PDF — malware analysis report

Static analysis result for SHA-256 935c7f7c41e69694…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 16:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 362f70ba07af07640683f0ad2e1ffbfa SHA-1: 83e0e1a1ec11b91955249b6cc69dbee7d5c826bb SHA-256: 935c7f7c41e696946dc1e06472118fb2967f6e77c47c3a34581c5611ae2ea991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://banquat.com/userfiles/files/lesorazivomofimek.pdf
    • http://allasclub.com/campannas/file/wavifil.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c7c5d787a394b56f9539bb1645ee7a40/52498898580.pdf
    • https://xlspandoek.nl/userfiles/file/58503770233.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2210a4cd40---zewuwukerewuxix.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231b9b9f8c---58569412378.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ea217f1f---22549571883.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgm8qa0r2gchf4i4q3ugl3th4v/89107794431.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67902855760.pdf
    • http://vanillasky-ch.com/images/files/kerixosaxaxobazamajo.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/da8e160fcc7df074cbc1dfb1f385130e/51015787038.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083162c85a2c---19206832679.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe8f7f710---82314234193.pdf
    • http://cortabellanews.com/userimages/jutadijepujeluzofoveg.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed25c1fd0---xisazikidug.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5fd3e34a---doxaxijalevude.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d52eb1e13---89430243951.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71c8eec71---wakupenefur.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cislj9quf1nobm0ts6j3a56lqa/43708379066.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/107913164b14c399891327b71eaaa921/livugok.pdf
    • https://go2germany.ru/files/file/56358468205.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/81080881d81e93d04891e6eaea311c8e/zevixolegez.pdf
    • http://alexhofford.com/temp/files/file/1158829923.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/44on96r5g3l30dcm2j5m19pqv6/rixinaliwunezajeselezutak.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abda0f7a1f9---sokoberute.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+river+gorge+backpacking
    • 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_off000102e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16792 bytes
font_01_sfnt_off00011afc.bin
3341b7b7bdbe3536dc397f43191e706fd0a2a3b0a3afc99a7bab774a846efdf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 10600 bytes
font_02_sfnt_off00013324.bin
db01ca097e471c24921e8f80b8b2829b652bf52c53dc3a2925ffb3c1e77f4614
pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 17532 bytes