Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e55ca1cbe5783…

MALICIOUS

PDF

80.3 KB Created: 2021-09-28 19:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6066344c48b010fd630f65343d80e55b SHA-1: 3f29bcc15f93d71235fbc6676817bc8b71c8aef4 SHA-256: 8a6e55ca1cbe57839a4269f16fd3e20d47094b299251bd14480e92bb7e21d959
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent. Although no scripts were extracted, the structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b515bf9d9---68163915822.pdf
    • https://grupahatak.pl/admin/_fck_files/file/93194130320.pdf
    • http://www.somdattabasu.com/fckimages/file/nufudizivadufav.pdf
    • http://svatba-emi.com/uploads/pages/files/54567060294.pdf
    • https://bisnismedsos.com/userfiles/file/kixivuretamoxegakadap.pdf
    • http://touristclub.in/userfiles/file/62351916066.pdf
    • http://goodfortune.hk/UpLoadFile/file///xegizepogebowuwumepuwige.pdf
    • https://yenhuy.vn/upload/files/53304155184.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4b834daa1---jevib.pdf
    • http://bmfjhjk.friend-match.com/upload/files/76490841748.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/xulozekato.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/23137098230.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512fe33bd09---xulirimi.pdf
    • http://jiin-torng.com/uploadfiles/20210907215339.pdf
    • http://www.tsahimmongol.com/uploads/images/files/nuxiza.pdf
    • http://intertexmedical.com/userfiles/files/potinasifufemamawu.pdf
    • http://thucphamchucnangmy.vn/uploads/files/luzatap.pdf
    • http://yuqiaohome.com/uploads/files/202109201236173721.pdf
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/12070331151.pdf
    • https://egokituz.org/files/galeria/files/35330584512.pdf
    • http://naviway.su/upload/files/tovepudomufewageveki.pdf
    • http://vanharteyoga.nl/uploads/files/68286799115.pdf
    • http://aylincinarli.com/fckfiles/file/5929608958.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=desarrollo+de+nuevos+productos+alejandro+lerma+kirchner+pdf+descargar
    • 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_off0000c612.bin
96e696e573d3f1b238a1341ce9825ef37cdcf75b8974f11f493ffaa10034e3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 11456 bytes
font_01_sfnt_off0000e0be.bin
4b7b461d6acee739ed12ba65c557740efd94c4e367e077c8ed0efb31c2e2a1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 21264 bytes
font_02_sfnt_off0001185c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.