Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3251af295bc7a52…

MALICIOUS

PDF

91.6 KB Created: 2021-08-12 15:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5038fc4eae1843c7d5af724b99ea2cf0 SHA-1: a81f09ced43b7855856d14979acaef975ee45865 SHA-256: c3251af295bc7a524300322df7b4deab2cd6fd805b3aa8cf80dfe84788afea94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b478917e7---76217338935.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94eea34f9---3893174709.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/24645965392.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b8osvbh86n6cihrv4q9b89lvr7/32916284728.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/varupon.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/gokemasubevo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/62963372225.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e724a410c9rhmcag4l307kvlcc/65630741814.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41326e739---21238936157.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/jixasedazekogufex.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/56491909596.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943978bb951---4745902553.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/totixexawurifapirufozurar.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vivutuzixinekalupebut.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/58680435451.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed29180c70dde782b584e21cf21feff7/45220213566.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/laponivodibusared.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/354b5a705a7d9c96cda6f550f565313f/govuwaxawetosewutoxo.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/pivatazojovujufipere.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210708_135010.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/nonadasumadopemin.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/95609306025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=avast+cleanup+premium+key+macPDF 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_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 17740 bytes
SHA-256: e1173801e8566b85a96806beb0cbda5b4c7cf55bd1ed2f8cbeb9320d9efe28a5
font_02_sfnt_off00014730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14730 10768 bytes
SHA-256: 79a3fae9837424b1193fd255ac0196b14395691937cc6683f4368bf2c4c07806

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