Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0bbcdea911f1ad…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 15:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a59994bb93554194ba9bad5497427f88 SHA-1: f7bf6a65365c5bb4a7fc41533c6359f0573a1fb3 SHA-256: ed0bbcdea911f1ad1225b817166f7d73085267bed51a250f799638c0fd653dc4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=oregon+scientific+weather+station+bar206a+manual PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161246ad45517e---76843809855.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/xizabimubukovozisu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/watefogiji.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/fivaden.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/51012085121.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100af9e33df5---40136739602.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/43112252850.pdfIn PDF document text
    • https://synersys.fr/contenu/file/36192125512.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8327e5a19---zukabifurotes.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/98554484156.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/13274221024.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tizetujidotarijilepawi.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/92627569742.pdfIn PDF document text
    • http://shesob.com/file/files/56907739673.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9079941a0---48380895011.pdfIn PDF document text
    • http://splogservice.ru/content/file/19220903128.pdfIn PDF document text
    • http://micruts.org/userfiles/file/24319454261.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/67780046123.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/74565786298.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/f4fe26182a80fde147a0289a7e3e19f1/sulunopi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04222f2170---toketarovajupe.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/likibe.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/70183126743.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbb84c84eb---nezogasakuxovujumajutob.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k5f2t32feae73m09ql9lmmib90/firuxutaxudolapu.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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 16228 bytes
SHA-256: c4933e56f4631afb4ba5db03da7ce6b551e7538d567ba6aadcf66043a0d7b5c9
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 11544 bytes
SHA-256: 95eb810cc5579dba7dd52ba9cb88a951e081b975d3b23950d9daecafd9808db2
font_02_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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