Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b47f32fbaf8d90…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 15:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71194ac4111932885873ee0b0a26c5db SHA-1: 443cf4b179b8c5c4d4cb49f1839d0e7b02dca2e2 SHA-256: 60b47f32fbaf8d9017b0fcb31e3bd3fb9566bab9b1819124cbf5f24f4864cbdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution point for further malicious activity, such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2260f4d6---51768689866.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74f97c444e---30258389414.pdf
    • http://matstravel.ru/userfiles/file/788606340.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/0dram18ua2b4sfa20hhmvumvj2/vafababarubozoxapizute.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b055bb3a---48181795912.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1d43e467461f7dbeb1813559dac13643/42194807399.pdf
    • http://aucoindeshalles.com/menu/file/23430768965.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f65tscfltuj4oekduhhuunif54/bizikadabutudozomitibuv.pdf
    • http://short-story.ru/upload/file/vifekumudotinatitumikok.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf409a89037---sosevetidix.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094399a62ff2---51323144536.pdf
    • https://farmacieitaliane.com/documenti/file/gixujabukiwesopa.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/sisukikuxoboz.pdf
    • http://group-anons.ru/userfiles/files/97244367187.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f6e8a176---98537164809.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/31183557069.pdf
    • http://sola-brothers.com/userfiles/file/99161490378.pdf
    • http://kalikraft.com/images/file/85149592038.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a08rek2uhgd33ni31ip75bn0q1/57575270552.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348abc7c3b---bewesusozir.pdf
    • http://akicgiyim.com/userfiles/file/pugenudiwi.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9k5i9pep1ka7v4ca2c81e4jg6/85385754131.pdf
    • https://maxflowfans.com/userfiles/file/26595693678.pdf
    • https://davaocarrental.com/images/file/gowowuvuxagazipawunakagap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=narrowing+of+the+left+lateral+recess
    • 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_off0000ee5f.bin
eeb3fb2b2fc5ec0ed9f482d99d632298b78b9348305901a58dd84a9f4f17390f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 10676 bytes
font_01_sfnt_off000106db.bin
fefce5c24226718e8f7ab4363a8938aafc52950270fbc56e864285a796fdf664
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 17236 bytes
font_02_sfnt_off000133ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 16792 bytes