Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37d0c5c1595a088…

MALICIOUS

PDF

72.6 KB Created: 2021-06-13 20:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 01f8edbf06882238b60e06e80d2ddd91 SHA-1: 1ee6eb210a4d6a97a65014c36eebb434d7aa5652 SHA-256: c37d0c5c1595a088cb0bfaa80989ca861ff89f3b1dbe270a79fad7e095493800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The presence of these links suggests an attempt to lure users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=worksheet+congruent+triangles+answer+key PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58e7ce34d---10623111806.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b197f96d08c---7085067631.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f19f83545c5affdde19bac9bbe139e36/60338018654.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b13128f32ab---56953426656.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/tisademigoloxajaxen.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/p8vrhmhlhdb1410g0dt6kc41g3/subotobakewemudasa.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mebefumegaletijigorol.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/59545246764.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2714d2d1d---60159353157.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd1280c4e6---24614099185.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904bfa7d40d---54185053806.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e61eaf4f04af6163fffebaac95913ad6/tipisemobemajudamibit.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e97e11be52153d01927d050742ec4c09/45583307984.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/04d2bbf0fcd8964f95c678eeeda553d8/59189283178.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/xalegexavesatuxu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4b90e903---15335084585.pdfIn PDF document text
    • http://df-foundry.net/d/files/69033166066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 5332 bytes
SHA-256: d0299f5e8f491fe5ebfb301e0146932788f2ffa7af53c33df6eb3325ac68380c
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10336 bytes
SHA-256: 9f02ea0af9fd21504cce42dd96640c33e3153213c4acb940ed5d9d2edcd2b008