Malicious PDF — malware analysis report

Static analysis result for SHA-256 5007018baac5367c…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 06:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528a8c89c8acdb06c9287c1480bc44c8 SHA-1: 09dc040b118a94d3764518ab4a5ef7f9566761e5 SHA-256: 5007018baac5367c3f867f93111ba5ff1d716be8ae74198e4a1a4cb06e8b9681
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute further malware or lead users to phishing pages. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://nomylo.ru/uplcv?utm_term=what+are+your+strengths+engineering+interview
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7909c66b---68583166374.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a6e1c5b5ac9803755264f270d57428e1/45111344449.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088056143181---lovekar.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/92611114035.pdf
    • http://zonazero.es/userfiles/file/tanowajadufol.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d05f17710bd946e6560650d76351363b/65580459241.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/14330f04a817c50582db79b26131479f/wogewumokukef.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b248fa8a982---lobuz.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835a7c72489---rinor.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/38137055553.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1af15620c3c8efc2cdbc72400142f14b/lofesajixomulakirovoxot.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc21c41e0---5146481902.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f77eda3aa---fogazizef.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3f8p2nb00uiqbtm8e9l4rbjbke/bukukego.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3848510a2---xeluvera.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c911210a1d7fd8bcb1553bc24b7b7480/monidimovoxul.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/st30stq3b7nhdo2ug0pvfjjotq/nulanebikevozolimarurovok.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/nbo4tehf3cc52dicsk9071la95/didamaguwimewirolinu.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/48912710036.pdf
    • https://baobihungphu.com/media/ftp/file/fafemodelixopamutupa.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a2eddf09a7d732866dc3c81c31c56122/wukozudureparoto.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/438f9e4a58717e3b1376aa9917d0dc96/55480714574.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adc421c55b9---jilek.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/993b175293935372585774bf020fae61/29331899697.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 16792 bytes
font_01_sfnt_off00010643.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 1860 bytes
font_02_sfnt_off00010ef5.bin
4197c67d757aad5c25659a91d75a141292a179076db10367554acc83e5db3a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 17968 bytes
font_03_sfnt_off00013d8b.bin
886b014326db21d4e0f954623f6f3dd227cbcfe8c90bbe3b26444709d8d428fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 10700 bytes

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