Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fa497866d9a045…

MALICIOUS

PDF

78.7 KB Created: 2021-07-28 04:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6dbc71a379c1ad570acc383621f968b5 SHA-1: 3c07435403827c92f80be0df32a426a2bd593537 SHA-256: 25fa497866d9a0458e58f5493a7624e73c923c7e1eaaf5564ce053204b6cd3a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to obscure the ultimate destination and evade detection, redirecting users to phishing pages or malware download sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daieimotors.com/js/upload/files/7856582107.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/li225o4jbj0o9nb79hk9hfna6f/jezenevizuwasaras.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/krbruskfaqercmiejshsjqokf7/30952679474.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/20022218449.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/xavupitafajetes.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cde3a838b15665a23e37a21487e76080/simufedomenulamilox.pdfIn PDF document text
    • https://buka.ru/sadm_files/37971183440.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/83660647767.pdfIn PDF document text
    • http://abworder.com/uploads/files/jusimif.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/74b1f23ac4b5c8627504bcaff4507a8a/kimozaxanazafaxexugikalod.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1b6704cd---vusuki.pdfIn PDF document text
    • http://cmtsport.com/pliki/kibilipotilevolenazisut.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/31452821476.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac1c6312---sajekage.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1ca35e68c877e6a60654285c08552730/70890559310.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/568d7210654c4f054d5578837bc1f88e/91800095693.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d9d1b3005b85de55707c57617c6f8500/madakiledupijuv.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/46080872073.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/45064989403.pdfIn PDF document text
    • http://orem.mn/uploads/files/pekubisegulilewuw.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/golesudefan.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5kajl4uefkb7c1g46ue2vqr17/likiwukutipebinonofatabi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h0dtmv545nfbjp9imp8bqdvs6a/wojowadonod.pdfIn PDF document text
    • http://renknh.com/ckupload/files/sigamimegapasofawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=assistir+novela+os+dez+mandamentos+2+temporada+capitulo+62PDF 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_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 11168 bytes
SHA-256: e64cf64eb5286045863e3baa17edaa0076c74f36de49f87f6dc74613dd94ffa8
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 17644 bytes
SHA-256: 8f333b27a997dc1c33ee2286271e728a70f6bf6ee55efd474a1ada010dc60fae
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1