Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c82f2e6c6e53041…

MALICIOUS

PDF

90.0 KB Created: 2021-07-19 21:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef91b0937ecf8a8eee4b77c2f686d746 SHA-1: 53fe68958871301a75f45012b7f9383ed830a64a SHA-256: 2c82f2e6c6e530416f8d022676c32ebb4c743d95d95a1ad03f3b9ff873665fea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

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://brod-plovdiv.com/images/67853448194.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430094539159497.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/abd7790bfad3f51b73388fd5fd57962b/kesunaluwuvidagak.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/66910660406.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/96549249302.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/91250093575.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dff372ff1---91966453233.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/dikipowivafanugigu.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/jebas.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/242b675a9ca340ca09418694f29ee1e9/posezatolojunivi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e2dc881f---musiwozewuwezexenolosatez.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/92520577773.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160986cec4b5ce---54761706722.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/89153627956.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/laragib.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/razaruzilodepaj.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/59ba9dd5e7a40b8788d92704a359ae13/45277348679.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/54241701170.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/542ikrnr9ttlgamhmn1hun0rf4/tupepunaxadomusegaforuja.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b3bd307b---lutaloxijatadef.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9635b8ffa---79287608586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=electrophilic+and+nucleophilic+additionPDF 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_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 17004 bytes
SHA-256: 9ef05f8b775e2b3b7eda1f5f8d493cc99b43a29ce810cbd6fac5a6af22634683
font_01_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 10528 bytes
SHA-256: 6c5958f4a2ae638a122bae73e06f70bc34fba9b4a28363663a9a9d5fb581a959
font_02_sfnt_off000140fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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