Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d0598bf151f46e…

MALICIOUS

PDF

191.7 KB Created: 2021-09-02 03:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4fbf1eba07d5d852e51dd1bb3c993c3 SHA-1: 55a968a7e7e4a5ddc8891cd41442c50fa3bcac2b SHA-256: c7d0598bf151f46e48ef1b2ae507bf033d1805e88a9b9a8cee1195bba4583155
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b20833a7560---97736298647.pdf In PDF document text
    • https://soechi.net/userfiles/file/74418018514.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fa84c784fa2fb530e1ff3774a4da1120/sakebedokevugul.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0dbb57ed---39617606423.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/82965621089.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/becd5b73e845ad5fd9145be234d6f6ba/vajugegominexesolotanan.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/48617390182.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/mewuritopiposowox.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/97541614972.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/1913585012.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wosogefobawil.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/vebosasikijotog.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eead83d391---55694510246.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a7901fac---tofexojewesufusew.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/71561723909.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d33b53fed---berofejuseguganodinewer.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd910c14bc7---pokunironiwusawijeg.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/97313748355.pdfIn PDF document text
    • https://gdaniec.com/upload/files/32850202597.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/62959992190.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444aac9f3e---xigebuzisabukivugijote.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/1258578909.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/87723246164.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lavenisuwevir.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/30853207317.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/15701884082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+guardian+today+in+focusPDF 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_off000288f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288F7 20340 bytes
SHA-256: ba1a225af00326b74106f2a7e4e23111b6e0e829fe29ef1b8f7a15ccb80f6636
font_01_sfnt_off0002bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5EB 10888 bytes
SHA-256: 5584b0afb2a303d9046926fb14c1fec9943172d9eedda7991efbc1a79df4943d

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