Malicious PDF — malware analysis report

Static analysis result for SHA-256 0383896c110de4fb…

MALICIOUS

PDF

101.1 KB Created: 2021-07-07 22:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a3494fe50badfdbd991baa6c5836f338 SHA-1: 6229a445c73b0a7666d77f250c91dc08e614b301 SHA-256: 0383896c110de4fb2f37f0d4fa6a6ed7bd3bf95aa9422925d094f1a2e3edaf98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fee45a72c---rifixorexisibarodina.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/988e20ef7082d1d1ad209541547c3978/gibipe.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/fa55794adecec2a6d2449522bfc2a066/1870915567.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e8945ed3---jepewamewigadelowobazile.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/texafupine.pdfIn PDF document text
    • http://cy2hand.com/userfiles/33958665631.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/59474323520.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/0eaeceee093d275ec7e0dc640ee6c5ee/13336595510.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ojbrfknr8k88ocdovef00tgisr/jedute.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc5ed6ea1---68191158219.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c63e5d78---lojejej.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/8ier55jfn35a293o3inunbo8g3/40881379029.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d7c319ec3e44695daa3e3d0b9504765b/xowimelepadinuno.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a3c812002---48301539708.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528014415306619.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ad528bf6---tofalofalanawegolak.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/57023952123.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/40010978403.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad893d0473---zenudob.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/35093427125.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/lexuvolar.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/77108542357.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/kopemuwoduj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f567754ec6afd43dbbae22ac9bdea348/zinalonajapiwubamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=yellow+lab+coonhound+mixPDF 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_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 17376 bytes
SHA-256: 59a64151de8e54395e67ddcd2c4abed2628bb7f318bef88dc393bc39f17753e3
font_01_sfnt_off0001571f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F36 10680 bytes
SHA-256: b838a968d1e60d3d43898defea1e87824b134f71dc5144663776387a1cadb0b1