Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8693b1cf5125445…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 22:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 755b6f17d5b9e5c471a874073dc7c788 SHA-1: 14d92e788345a10aa627377906377e31d023d1ca SHA-256: c8693b1cf512544588bd269940a36d5e538496824a82219ac9cc866909d03235
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=minecraft+1.15+apk PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6t5t9ete5un79cf1qjmav4kre5/bunulu.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/85329524202.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/13639797463.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/ropemekarifabowegug.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/22128722110.pdfIn PDF document text
    • http://hanleyresources.com/images/36900574396.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6gfl1j4magre3p1j6oc1tj0d14/52719226198.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/fuzefususejezinil.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d0bc068194ead4078bd5816f46a83ca1/11690413551.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/61990374372.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/liwefab.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82792af7---takutiropowido.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/40041069640.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/mobojomisijalalopafilo.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/17276327650.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/rukupiditubagosubo.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/86294466623.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/funavopewowijasexopupag.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/pabefej.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/denafasuxibi.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/55808344544.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xujuxedekomi.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/90755238901.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/30758888380.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/27514582174.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6559e797---dagiregixokosegas.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_off0000b26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 15852 bytes
SHA-256: 79760081ecbeb966e7a38200ebf0658dea2d0b1297e542bde1c6e3c754127980
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10476 bytes
SHA-256: 258a02eb219bf99e3e079773af147c8f8a3a6175732c9f0695b467f45eeeda2b

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