Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b9a6f6a64b06a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 14:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 310d728804eef9100c81636d07bbfd69 SHA-1: e9669d7e14d8dba9fb01df9788d2e318e103280d SHA-256: c70b9a6f6a64b06af32c105d60cace855b3c6911cd35d2cd3526713406fdaaa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=don+quijote+miguel+de+cervantes+pdf PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613604b08871d---xifufi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/nubofokalur.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/88824867903.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/riloxawi.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/66502618068.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/66621202515.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a4a2cf24b12b514ac22a341483697f88/29630708349.pdfIn PDF document text
    • https://samudra99.com/contents/files/vitozuxepuwujabikaja.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/91739023318.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/ganodetigidivaw.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/mabipovurovolupeker.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/97262797171.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161379edd71611---7318439772.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/rizukus.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kugugagir.pdfIn PDF document text
    • https://alohasafaris.com/files/kebazevadewujozos.pdfIn PDF document text
    • http://farashimirooz.com/files/fexibikifetanud.pdfIn PDF document text
    • http://theponghop.com/upload/files/72328905857.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/tofesiwonovakawefa.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wopajolij.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9f13f3cf0686e337dde81a7d840ca77/93492658787.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/38242770288.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161381abdc4e17---geruzomanasibod.pdfIn PDF document text
    • 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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 11408 bytes
SHA-256: 4fdc1cdd32b8e051ce55897ebda29121ea3015db229edcc7e272bd340b0b107a
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 15748 bytes
SHA-256: e90e0620e8c7dc4a5313a99cf44d828e29ad6bc3667a1aca5d7f594be144ff1f
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1