Malicious PDF — malware analysis report

Static analysis result for SHA-256 9415207d6ed48b5a…

MALICIOUS

PDF

100.1 KB Created: 2021-07-28 05:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ab5b38d3e842e55d3938ae2b4f7b08f SHA-1: e0efac5e046fed33a34b5237fe6a294ea66230ee SHA-256: 9415207d6ed48b5a89b3cb9bba9ae57844a2e00970df2ee5ef8069e4c4b02a09
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of these links on potentially compromised sites is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160982c37e9c33---wizudukijugojivunulob.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef2bc45d7---muwowawugepojelemabetala.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tudukaxusafegewex.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/vipufuxuxulodelefiw.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/rafutejudufasebebuweleko.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/2527606692.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/9136136382.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8250a02a2957cbff969b3825463c9029/50173179735.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6b5eb82f8389a27ca79d2e92711cc21e/zijuxub.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fee954ae5---xazofaxetimorijakibu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1fghol7f94fvmjtqbk9h3hshk6/jorejejipudulizu.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/72f56e35608a99883a0de0921af1fcc5/nawodabonexaka.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/gawabafivenegejomamoz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf624833457---62111142447.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2b96783e---zepepifavakevunujakis.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a672d1bbf10---53727923339.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/18092716286.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mei5ev1d6magabsoar7ci4dt8o/fopabavigomunesetasif.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b92f6b1f6---fuzinamaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+long+can+a+gopher+snake+go+without+eatingPDF 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_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 10920 bytes
SHA-256: 046ac92920097d4ebadf8b6e088f8f88e32cfc19286d800daaaf7f4c4b2d9f25
font_02_sfnt_off00015425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15425 17528 bytes
SHA-256: 3048bfeee7f75ef4db7c6d8d03645f25fa109d67ff5a0cbfcab076b73a0a0216

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