Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2a1e14c27ac033…

MALICIOUS

PDF

91.7 KB Created: 2021-09-13 18:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c30a682f5b383e62fa6b0ae909e011e SHA-1: f503399c6c2e8fcc7a4fe05298578d7d0cd1a440 SHA-256: 7c2a1e14c27ac033de4b78ed3ea1afd538654ef2303443ef5320ba70ccff12d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with many pointing to compromised CMS uploads or disposable hosting. The embedded JavaScript stream and ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware sites. The document body is unreadable, but the heuristics strongly suggest a malicious link farm for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=and+so+it+goes+full+movie+online+free PDF link annotation
    • https://nslogisticservice.com/userfiles/files/43050098683.pdfIn PDF document text
    • http://benly-carson.com/product/files/limatamarajefasig.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/16908302544.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/30908043160.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/weviginifiwelamadam.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vitiwige.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/17944409104.pdfIn PDF document text
    • http://fabtur.ru/upload/files/92664974623.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/74661138872.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/24254629821.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613847ccf1e57---22027105730.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/20718548692.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/34cc7f9fab5eeac5e87c57655cff019e/28242610295.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161394d902f0b6---mebolobokegapejisidu.pdfIn PDF document text
    • https://panoramabyty.cz/content/radetip.pdfIn PDF document text
    • https://tepihtrava.rs/files/82656678223.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/26975180914.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/domubifebijodaresosi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfed2e087f---dopalilefuxene.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/butesonuzinokoza.pdfIn PDF document text
    • https://dom-titan.rs/files/fevofelazamitafomubege.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/bageduvojugetuwivezeje.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/91747764062.pdfIn PDF document text
    • 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_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 17228 bytes
SHA-256: 2287aa855f99e5d6d666978cda61a9a799bbd4833ed0bf7fb48c6cc520c1bad8
font_01_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 10680 bytes
SHA-256: 6ae102a163034df6253cdc43f04955e13765dfda1ef1cbf287a2ba1453f1c2ab
font_02_sfnt_off000148d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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