Malicious PDF — malware analysis report

Static analysis result for SHA-256 c432d86965ba20ad…

MALICIOUS

PDF

97.9 KB Created: 2021-08-19 01:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a09a6f25e676df159cdfc3f3ab6300a SHA-1: 8f89ae9eebedd11dcb7477e363aee1fe136cc359 SHA-256: c432d86965ba20ad88dc38d576fe89d024cdef686f8cc8761935ae9080ef3e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised websites and disposable hosting. Heuristics indicate this is a link farm designed to direct users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/65406bc67e0b4dc1e352a01fabea16b4/ginemamoj.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9161a8c090---6683502666.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/99644658425.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d114b71d9---lukadunisubizowur.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a4f32ada---78798373390.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/efb259dc822df7eae260f6bd1d75e022/96136602953.pdfIn PDF document text
    • https://vestol.bg/files/file/77828059953.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/69188580192.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sqphrptqjo5skjhiv4g5pmveo5/xamatefubugoxike.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/bidusukidazuzo.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34338737530.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/kovukepoboranukij.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2bc17a69a21a1c04a6f4977a4f2a1663/46519004194.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/42213337141.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160770e9772121---34035336717.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823095c66d---kebokijivu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15013c98e---96846481380.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210702154313_j9o8wb.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/zajifisaponuvitete.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/87284891955.pdfIn PDF document text
    • https://baongochoa.com/upload/file/99231227713.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/runikemukokegonofabuwi.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210707_051539_154.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607685a83eb7b---72068452461.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/fularubokepuzojavifanudej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ielts+writing+examples+pdfPDF 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_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 10860 bytes
SHA-256: fa4102d77457eebdd2c2c68236c63b24843f99c8fe2fb6141d706c53c1536723
font_01_sfnt_off000131b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 18032 bytes
SHA-256: 792ebbb03530eff66dfcedf69121c88cfad34b64cf74c768a253999095a03898
font_02_sfnt_off0001613d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1