Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f3406acdb4afe…

MALICIOUS

PDF

103.4 KB Created: 2021-07-17 01:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e8f0a37153b572d38bacacd9b3b879f SHA-1: 1822c7e7c92c88f149c196d028be8a620dbadf43 SHA-256: 2b1f3406acdb4afe7d99e4df76261a2b287ecd96f6844f0cee4f46eb92e57a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0i18j3poi9jr9is9at3uai44t/4308007247.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b021f2ec596---kiforadezoridakupizuvik.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/95474743306.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f33d47bb.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/sawifuwibafozitixu.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/41467165474.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/23037073769.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5f358bfd---lelikajapas.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/56dd412b2c223863fed09756b8d4f05d/43259132274.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3146ad82---28647270916.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b80972d5f---bevugonudeb.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a29c5b47af54b85a778144ab28ee7541/bafawago.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1cb9e7be94383202b00e3463dacdcb16/jemanesol.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/eck5vh3qq1335jisi26u1j7o4b/nojosabotinifomaxifoti.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b20efd7cc91de6a8e3052015eb53f6e3/vabodogizabazilo.pdfIn PDF document text
    • http://congluc.com/upload/files/kajumupunuwa.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/72096349772.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t41frj7s3frhr4ik9gth43p606/65373423815.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/minegapok.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89b116229---kuzomokefezumasine.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/495de613f2fd72d14a9c6f05ce286821/xerekid.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/32813995179.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/74531402416.pdfIn PDF document text
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/54726816110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fifty+shades+of+gray+online+freePDF 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_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 17800 bytes
SHA-256: 33a0a9a81cde8fb73b063fb1224b2f48624eeb03652105c4be4da082fd1c7642
font_01_sfnt_off00015fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD3 10724 bytes
SHA-256: 75030610325ba5f6c536cce12d1cdbd68533e4d7837e03cb02b46faf10ddf6ba
font_02_sfnt_off0001782a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1782A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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