Malicious PDF — malware analysis report

Static analysis result for SHA-256 88841d629a4e2393…

MALICIOUS

PDF

106.1 KB Created: 2021-08-17 12:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c46b0f93f2512582bd5a3434087fdcd8 SHA-1: ac85fb71b6301f5215582d93e1bc04bf38f6de14 SHA-256: 88841d629a4e23934fbad00d43df32a47ed8cc13bbd438f3bf5c62036eacbe93
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to a phishing or malware download page. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3625db53---4666454552.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bnrqp9us8g79pu6h7r9joh007r/67358295730.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/sec2v640l0opf2en99pl5rbaaf/36283821613.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/96001337205.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/d9qjt1fn5jbiuavtkcfkk8ub5j/96253406623.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16f80a4097a733b4926fb88e1f4b12df/63434717128.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/67961660021.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/domiwitok.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/13e2388b8c5a4f7e69beee0cb4683b4e/buroxasuxo.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/kinemuroxevovuwoxumozutaf.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b027aef645185d86ad70c84df75cc62b/80686258519.pdfIn PDF document text
    • http://yanartextil.com/firma/files/22841091249.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210807062240.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/21888422889.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/famuziduge.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/dodux.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/62294677834.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/37365594855.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/80453060858.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/72272257033.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e12fd4af0c37a375bce4bd5a46aad82d/32972988670.pdfIn PDF document text
    • http://greenbrier101.com/userimages/87124555320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=deviation+investigation+report+examplePDF link annotation
    • 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_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15456 17276 bytes
SHA-256: a8cc901d6fe91a5fc1fc36c0c56b01e2f15261dd6e9bf7f6519710f4f7f046f2
font_02_sfnt_off0001814b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1814B 10764 bytes
SHA-256: f10a29e406b93ebd78e90eeac973c746dfc06c2f5f30a25484e86650b10b2be3

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