Malicious PDF — malware analysis report

Static analysis result for SHA-256 1251ae1e5bb920da…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 06:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 419ee87dac49c7b264c2f8cfa387b8b2 SHA-1: f63e0fe79228a60c14567ffcd72337011f630675 SHA-256: 1251ae1e5bb920dac781487a84094b9a0d29d9e7bb28a78c717bce35a00c3377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pistant.ru/uplcv?utm_term=the+law+of+torts+has+largely+developed+through
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/8017e16d2cc7e9eb5fd1d8daf52745b4/vugefav.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd200064d1---62264923510.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7ea72fa38ec442bf2f00de3e30baac21/81828094241.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3cc5c00f---39761511780.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rckcg4gbmurebe6hvscg4d5cvo/31213927564.pdf
    • http://pulsarvn.com/media/ftp/file/xizuwatibalavagu.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16078796094f01---lowadunujebibazopatuta.pdf
    • http://www.jindatunnel.com/up_files/file/tipegolasi.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b58c740a423337655c38961ec1479ca9/12895241381.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0edffe7ef622fc8240bdff02f3941595/90005522212.pdf
    • http://paroissedementon.fr/upload/files/rinowoso.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160772810e8520---mebafamedugogezusepava.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0aebc7rme4ifau686ar4163ne5/18229420653.pdf
    • https://reparation-mobile.net/userfiles/file/bujifobijuzejoxalatoxumil.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/07b5e2d5e0a2f21dc6b2075b28d643f0/97218652114.pdf
    • http://toyteepee.com/uploadfiles/file/210510003453929730dnydl4.pdf
    • https://lawyerupsmart.com/tempimg/file/36587548603.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/690b62f86a2d52ed39b62257be8d2895/xawojaxefodexozeda.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cou9pouq905ov9ku94qs0jkps2/37104273650.pdf
    • http://heyumpnd.com/userfiles/file///loxaxedugotalazof.pdf
    • http://cutencuddlybreedables.com/_images/file/nibukokuluwawapefaba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e942.bin
fa0bf6d9dd48db0c9f253da0b215ba2bdc891d99da372595651cdca596be014a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10908 bytes
font_01_sfnt_off00010299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 16792 bytes
font_02_sfnt_off00011aab.bin
69b2f46b981c1b553e494bbfd60336a4614961db7456b75c663aa648c6bb2240
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 16788 bytes