Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc6149d3b76f5f2…

MALICIOUS

PDF

74.2 KB Created: 2021-06-29 02:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f3adb12dd4d91fd5d87a74352a22be8 SHA-1: a14723d87d2e4fff518a0bb0bf790b67ed25f834 SHA-256: bfc6149d3b76f5f265735e557bda93ad18d8820919b30116e01518affd50a597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=free+online+anime+porn+games
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a18db7101a2---29782746026.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7bb65f1a1195016f099871ac3f8f0c84/56714088539.pdf
    • https://nestaerospace.com/uploads/file/55745243377.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d00b07b8a---69377710367.pdf
    • https://jdlpartnerss.com/userfiles/file/26660719453.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/g70vb5renv5vj8i0dhubnklehv/subuvijegajedopatu.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0ed16632526f2d800e58f6a76685bb28/rupufujikuruvuni.pdf
    • http://zulassungsservice4you.de/bilder/file/lorikiregojodoman.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5bcbc990db069f9e5cf25b948a14026c/jotusosozasedut.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sezamedanu.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4b1c6a8520942e51d592013f2b4c579c/14434198931.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/q4vce8maoa234rh3upjhl8am29/migikekawiwalewo.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160798194a35f6---dupodasi.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/upf92dv54fe488fboiealg0b9r/kofinanad.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cf9ae1d1e---95527385372.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/88435125945.pdf
    • http://lt101shop.com/userfiles/files/duwozevijefowularadizike.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ev78hcn8jd8ba4uvt6a92dgv43/4389194311.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/96c1faa65570b651084d7265413d75c8/36644075858.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b339d72e247---felujos.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9b108f41cbd9e7c38d21df6659704e2a/19779764992.pdf
    • http://braciszewska-klimek.pl/fck_files/file/kifadexov.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/967949c766a0c495a560f9bd0e4f9e09/kowona.pdf
    • 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_off0000c006.bin
3a2a071f7d6353885620007ded1c9e291f360692938fef9f5973ea42a5d3fd1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC006 10476 bytes
font_01_sfnt_off0000d7b0.bin
5fd1ad3a230ab52bcf26b876d1a30c3917188cdc6b0dfd00887d4386bbd5c648
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16736 bytes
font_02_sfnt_off00010377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes