Malicious PDF — malware analysis report

Static analysis result for SHA-256 b894ef946b54f8e3…

MALICIOUS

PDF

81.1 KB Created: 2021-08-19 02:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b799e52b85844aeb3a156df5e5e5c5de SHA-1: 9e563c0fec65cd31f0e8782f8d9c6893050f9240 SHA-256: b894ef946b54f8e359b9b3263c55a83402f5f51b92cc1c0cc2d9872742c956fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The primary function appears to be acting as a link farm to distribute traffic across various potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/v65anbpbmuusni6r2pb6hck8v1/voroluzedafafaroko.pdf
    • http://rnralpha.cz/res/file/9200101107.pdf
    • http://computergramm.com/userfiles/file/bedimiximoxoxuvafog.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d386417a3---nesusokitosolop.pdf
    • https://nitdgp.ac.in/uploads/userfiles/files/90691782670.pdf
    • https://jager-ig.tw/up_photo/file/63335871916.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f10e7bb6---93021406085.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d747ac0fd---3423463034.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210610_AFCCEFB884A54100.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/6e4b4f7ef26b66167fe0ab5990883136/11489006098.pdf
    • https://beaszemin.com/files/tufesulixeguditu.pdf
    • http://eprdel.cz/userfiles/file/22117430414.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38681d125---70208098069.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63076a9794---xanodagetug.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/97433129611.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a2b78ca49---remamagabogotirata.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b72aaa4bb88---nobibogolikegalifoba.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a4fefa80---84484810556.pdf
    • http://pastadimatteo.com/ckfinder/userfiles/files/21868701265.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae26cdcdd---13518406661.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869eec02c00---lasusaje.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160775a412816e---36316651584.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/66471344446.pdf
    • http://eko-inwest.eu/upload/file/juvojakusi.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f353ef6c4e56f64f517ba5155ca16a12/92928832382.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pegem+akademi+kpss+tarih+soru+bankas%C4%B1
    • 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_off0000d4d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 16792 bytes
font_01_sfnt_off0000ece6.bin
01f4f295ac74dfa98af5cc4868a4bfc23ed3959482b36c2e86be0261fede5fdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 18776 bytes
font_02_sfnt_off00011b23.bin
adaa5b5dd22b9570f0741e0ed140b023c798523c7a7d20e20c0c04974db877d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 11172 bytes