Malicious PDF — malware analysis report

Static analysis result for SHA-256 810e1c5eb7320785…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1eb0b3ba2d83030bc3575c9fbb603419 SHA-1: 87470e4ea7e4ccdb271d4500fc7cf5d17b7e5b7a SHA-256: 810e1c5eb7320785bb602523b183052acc8d39d27b5cd4e64da474990753bc6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=sick+building+syndrome+adalah+pdf PDF link annotation
    • http://igorodstore.ru/files/userfiles/files/45962158094.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/add382c2871b07d86049ce0290184df6/degiloj.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/bosari.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/junibem.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075552f65618---39634915042.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d334edef7---90187329909.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210609_135120.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/76637997379.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa5ff5cdd7---38709646017.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/15558586721.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/83779292460.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f54df228a---bokejovebopapitosagetun.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006c0e79a9---xosinavezawefedelemobev.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/79983032004.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/kijuzemepomidovekix.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797b5c2a775---87767890645.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/bulawasizaga.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f08ea4f4---sikowixi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/36b08d7a421ec8c55ee7c8da2b193d2b/rularuwavugijin.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e0b2fec0bfc4ac809ba9f45cd2602c6c/25850353400.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77523549319.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_off0000b6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 11492 bytes
SHA-256: 17ae2dcb90c078d51f29f3f23b3d96f267a173d3ece758fb964b15e48dc67049
font_02_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16052 bytes
SHA-256: d2d50372636de14fbec2df2e862940585d204f8fc39e0e7a113503f4f669139b

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