Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b186c76af72d7f0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 11:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53e051d0cfef375bed707cf6e35383cf SHA-1: effc377a44631f653582390b84cbf6df0f55c789 SHA-256: 6b186c76af72d7f00fead0a7c66381004882478d4be6f7e3bf3d2451c5f79577
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5rg4bu6f3ar4rs6abou8m53tgh/12049912312.pdf In PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/zowibidirumomijagure.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/68855532652.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/42813148857.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/31911235137.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637d6d06b3---71495181315.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/76814988520.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ba17cea3---lapumimix.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/livexuzotava.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804226b8459---motuxumiwojipav.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/abc83a731d233591c12543d004712333/98174655117.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ff16d9fd---luzunurukotovolumeru.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/walefavimipiwofewizen.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/770d0260902c7467485a3b48d6e4534b/gosarubalujozum.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/daxes.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/933dff681b2894332dc1f7a97baa5a8c/zomabozejugulut.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/phelkv248jsh8pre6vaj0mt7m6/dewepufazejaji.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/90531864558.pdfIn PDF document text
    • https://irantruck.ir/data/file/wazezubi.pdfIn PDF document text
    • http://evola.it/userfiles/files/19565534531.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/13239990715.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/lizifuzazibulopobe.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/24488498727.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c709fd7b6507bc52e2f6764a08dcec54/vatoxibiwigij.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/gigoxejenorixutetox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=water+immiscible+solventsPDF 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_off0000bd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10592 bytes
SHA-256: b7f0e0a40039e1a8411169bf57d7852cd06e500b81deb47f5af2645aa88b489c
font_02_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 16024 bytes
SHA-256: 318aad79c0392e156cd7cdfc37abeb6ad23dd4fca8eb9c76091b66cc45e44335