Malicious PDF — malware analysis report

Static analysis result for SHA-256 f689ba641592a256…

MALICIOUS

PDF

77.5 KB Created: 2021-06-27 13:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 681007ee79c8ba0192bb0a8df19cba1c SHA-1: c7fa4ab4ae5a65f238ad23f1304db1d3a5a0c8e6 SHA-256: f689ba641592a256b73aacf7d554c45c6d18948d687ccd582d447d9b9fc55946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external sites. Several URLs point to compromised CMS uploads, suggesting a distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=the+bible+of+options+strategies+pdf+free+download PDF link annotation
    • http://doo-san.com/userfiles/file/20210614155024.pdfIn PDF document text
    • https://tavio.ru/files/file/56788273845.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/52952759176.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/fiwejadojojelofaka.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/39427029191.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///35652400622.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/pomeboragufoje.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08d8936dd---nutedobofodepirikuda.pdfIn PDF document text
    • https://ms01bet.net/contents//files/jafiw.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/55223495490.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1080a7a0---neworori.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7f284058---9410169739.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/99096999395.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4c3186efae666e8397b01a2c8605881e/21753168696.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9e18414c2345df23d7fbbee319981f46/35750031980.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jinajunol.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725068d9734---4899709400.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d2c7dfab0f8f1be257dcb1957b0ee2ba/jasuwofozi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/86eff448ee8e959aabac6798b7036014/86923419574.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ce510e263446160f3591989cdf8fc7a4/nilopu.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/77950632327.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rh626at6d1l8f56an7o7fg9haa/70624224413.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ultq0msceedcp42sa5t0bv8130/xurujemaroboto.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47413480d7---vipim.pdfIn PDF document text
    • 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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 16484 bytes
SHA-256: dea137979f76b6923ec5654b9b51835f437f117f1c0a2b4da9b63dd911d73765
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10964 bytes
SHA-256: 0d073251553cf23b2a5548732768bef5ddb5bc4fb24c691a9ebe49be45f05a5d

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