Malicious PDF — malware analysis report

Static analysis result for SHA-256 692a26c2f5518789…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 06:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3c69f51bc00f3eb14e24912dc9f8c6dd SHA-1: 97cd1edf49ca913057b71744250167b1ac9b51a2 SHA-256: 692a26c2f5518789d326d663bf30f0911d0a06041b3371259630469e94ccbc8d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5769

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://philabc.ru/uplcv?utm_term=forever+and+ever+i+love+you PDF link annotation
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hpjggqhlgm2ss66hokem9vqns1/8099899790.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/vj1vsc7vpkn8j08r8sj2350pem/45162940740.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zadobarabewivarodikub.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7m3kpt4mtd9q6fcb934hg83maq/lelekiverizirowadifamav.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sm7pe0g6j7kiv0dfhbcmddglcr/25312783966.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/49674784cbffb2afc94a6b3b435fbe78/72743771736.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c32ebf7649819230cfe241d8ad8f11c5/26809050389.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/vufukavugavapapu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a497dc8dd---69514027819.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3a18710b9d920928491dcfd24e437233/90445831217.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/sulivukutukenagud.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f75a5a461---29624909242.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/32313254609.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/gigulijumur.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/punegor.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210702174705608.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dufabodon.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084055f6bc85---47172487526.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/98634121058.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ac1df4f0---gusemitiwenufu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa7c0cd94---83565110337.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7e328513---13451572071.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cdc6b06d10af81c80a1e3fac487a53e2/xiralasadiwuw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e1db2fa8---8137048959.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-cIn macro / runtime command snippet
    • 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_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_01_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 10232 bytes
SHA-256: 12e20f4f601e9a31de225445267f25e0b92be028af66e1d107210b9027490e69
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 17352 bytes
SHA-256: cbcd05f49d41c8bd6d41a3ef6000095e7027925b49086ce2c10d03876999949a

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