Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dab9a69ed90276e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 13:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f891bfd3bb1d255c0e0b5d4d0fb790d3 SHA-1: b6e7cda259cbc801d3c83f6fd02b35f41d882415 SHA-256: 2dab9a69ed90276ed7609a77f075bb347d5e28559e5552214ab99f45da9f1c23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://alkalacarservice.com/public_html/userfiles/file/naxot.pdf In PDF document text
    • http://saltokisport.com/uploads/files/4808412533.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27b00c431---46421987300.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/laxapowitiroselab.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/belarib.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/9763175286.pdfIn PDF document text
    • https://cian.hr/userfiles/file/45003443629.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ff00d5b9---14150439450.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/27673509683.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/zazalikuvogeguj.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/20656189645.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7cd6bee12---93514063986.pdfIn PDF document text
    • http://domainecomps.com/documents/files/modekefokesonatajidarokar.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161381a22217c9---74821730678.pdfIn PDF document text
    • https://ms2oke.com/contents/files/8252811099.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/84622431931.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/rikukamitizipikurexigonut.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/xiwunepemezafejirisaf.pdfIn PDF document text
    • http://ombs.ru/uploads/files/17141717237.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/86939268191.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/67767052787.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/88854756758.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/92159230286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=join+and+clash+game+downloadPDF 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_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16532 bytes
SHA-256: b31080fc41767b69b2d62bba3dcfe51e0ed8afa968e18f354956c6975eeefaaa
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 10696 bytes
SHA-256: eb33607fef31f8bdaf8f0913ecd091366bb422f0732980d66a04888d03759c20