Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cc77f5c9010774…

MALICIOUS

PDF

86.9 KB Created: 2021-08-07 03:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8cd1ad9f46df484a8b99d911b6cf78c SHA-1: c9b8dd07d27b303a90dbf033c1982b9321746300 SHA-256: c5cc77f5c9010774c48a874bbbf2d7ddfc9628f4ce68ac06d03b46b487ff2613
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/sagibikiwesozaz.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd6509391---desatusinam.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/vamojavofiwebitanogizo.pdfIn PDF document text
    • http://rld-carbon.ru/file/jiditimegajazemed.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/98467214887.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7fcddb745c2ee135aa02d1cb4b5c3373/63809038370.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c933648f090---puzixipa.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4a9adc2aca370893c2eff2a1b494e01b/43774331605.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d424cd5fd2e7f21c17f04a349a9767c5/89242421475.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/dugogide.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/dawepexisigivakodukunoret.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/kawevuvodimu.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/banomuporisuvevaneg.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eaa61d407---31817361314.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mp1nml3h4skcdirvf3bjodtatl/jevirovimuvadeniruzazomo.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/95489232712.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/vaxavoxidiso.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/28226209720.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/futoboxeji.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210704195756.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/rorekaxiwarar.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/92851273975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dell+laptop+audio+driver+not+workingPDF 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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 17180 bytes
SHA-256: 1b04e6062cc0d2b46925238ab6f70702a172b86667176384e61d5f6e2b6d004d
font_02_sfnt_off0001356a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356A 10744 bytes
SHA-256: 6cbd2e7b0ab51bc433017d2cc46dd095f93db340fde3d2dce5b5cd8db079057b