Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df5191a23fc800c…

MALICIOUS

PDF

92.2 KB Created: 2021-07-04 11:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c911f4b938597b2d4f619e04b58eac8a SHA-1: f069d7d53e1d6b7ceb8bf8621100b2a9aac20bac SHA-256: 1df5191a23fc800c9fa06c51155cc9d1c2a12f2505c6b1b22dc36fa7797134ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=active+listening+book+pdf PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a18nd6u08h686sjbdg29nfdckv/wutedaribugaxidefikekipid.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/fegosozobogosek.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/94451772138.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9563280a45430ca17bef4a756b76460f/48916757661.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/tozawokomafajupijido.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/dpgl1jro70hug3ci53cotls4tj/65847033822.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c173421be75---nazipov.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nevakigesulosowilaz.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/nidofe.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a213172ca9a---peronuwadikedajinirafej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac007c1124c---89649352711.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/9959238388.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fd3efd3cdb255b262e1b1c3d514773b8/gotezatuvikaxumizi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc17f16f2c---16745657641.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/xitewidibuwewed.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160804dc047082---89996605638.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/19088355185.pdfIn PDF document text
    • https://luminex.pl/upload/file/82834869165.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/dudatadozudoparit.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3314b76bc---64528656724.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ba46dca5af25cb642891cd85d2d872f4/xuposudikaso.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/33900303262.pdfIn PDF document text
    • http://kasargod.net/uploads/file/xupituzewutowefezeliwum.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_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 10812 bytes
SHA-256: 6eaca4772608a7382c34074a2179d5d82eba3c0668a75acbc574120b96323b67
font_02_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 16880 bytes
SHA-256: e80ae03335f2da55271ad591666cab57c170b82ab8aa6d51d2cfd9a064f7b642

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