Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36049c74671a24a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fe2a71144f80d8fd84dd0fa35d50d4a SHA-1: f91b44887f2f6ada6ccaa1a43a362b6de91fb6b1 SHA-256: c36049c74671a24a76cdacf84fab45593196b6d57e1f46b5ec8504372bcbfdb3
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to deliver further malicious payloads or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://clubesolbra.com/uploads/files/14677311154.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66925cf3d6---54955439357.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7067969c0---69406242232.pdfIn PDF document text
    • http://yjccnc.com/upload/files/30462657073.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/sepidiwotidupimi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6121ae4857fd5315b8c0ffd352362eaf/lejogap.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/52492122183.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/97469748747.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/92765985964.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/9965753250.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vagibojoropibepamulud.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/kjvfk0v2sb96dq0i6msfdllie5/nudidujopifapesidiga.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/013e51da672a8f507270d49269ce7338/fonojezisuwegogorisene.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ef1a6073---91441051262.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/67671301663.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/88550502921.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b26adfad80b---xubozuwunep.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6d826cb9---62443039661.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/lukebamonutakelowu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7d953db1---17722846816.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854325d023d---duwonogidovosi.pdfIn PDF document text
    • http://www.bandungmesin.com/file/poxobabesudixefatamu.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vukerawepewaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=most+spoken+languages+in+francePDF 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 19016 bytes
SHA-256: fb8c1c6c27e1a068de794bdfd57e793d6ecc28af6eadbf906bec83536631059e
font_01_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 10840 bytes
SHA-256: f756d01fa7617680f403983b6d383711eeaaa2f1fa28bf45cd050462999440cf