Malicious PDF — malware analysis report

Static analysis result for SHA-256 21594afeb209a0b6…

MALICIOUS

PDF

70.7 KB Created: 2021-06-29 09:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcd0cfd61797daa898898dd476de0826 SHA-1: ddd78a38034dcb135d161331ec578103d13cc030 SHA-256: 21594afeb209a0b6752769581c9c635fe98f9dc7fa7c4d3bbfcf77226b07916e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d2613393c079305f1f87cebbcc694b18/zafunaruz.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9tmgchfhkf2vdggcnk3l11kfgh/98092345347.pdf
    • http://jirehenl.com/userfiles/file/280228308723.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca365ea58d1---kelepolokabemupalage.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eukimns4i6879nih0n269ap32o/79276500306.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57f91f352---zoxebetivopaso.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/nglngkhiu27mkbb0kj2vnt0ho8/gawegokizatopefera.pdf
    • http://studiomanzella.com/userfiles/files/babodelunojekik.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fad7beaeb---nakadetofotuzogo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce86037331d---66954141170.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/bagoperuvibaketedale.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608044f750bcb---begikadezubumozu.pdf
    • http://vattucongtrinh.com/userfiles/file/jawatopoxatufoxalirelej.pdf
    • https://netshopnepal.com/userfiles/file/29709092276.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f6b655b7---xejakojulejidub.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1447b531---merukususafapanutokum.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5302323619c357c66f83f50c636419fc/80160552845.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c108b94d737---kiwarivitemakebapu.pdf
    • http://bindashnews.com/userfiles/file/93417327257.pdf
    • https://energooptima.hu/upload/File/bopor.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e47f3d8c6acd2ef110cc65992127c034/90722400168.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210604162718.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=two+step+inequality+word+problems+answer+key
    • 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_off0000b477.bin
d54dc2dd49862f020ec00337c16d43cc233dcedeaab0402b25285aa1bc6f0cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB477 11192 bytes
font_01_sfnt_off0000ce52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 16792 bytes
font_02_sfnt_off0000e664.bin
8bb15076d9b5978d8176b327d1d94afc8c697a3456b7a10b97c2eb9317ffd168
pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 15460 bytes