Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8c7e0b33a0a769…

MALICIOUS

PDF

99.3 KB Created: 2021-09-16 09:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b28dac28101a394efe5de785b2ad16c9 SHA-1: f6d9fbbc454c9dc66168f03825d1e2adc4289e9f SHA-256: 3d8c7e0b33a0a769cbeae6f8abd9de9fae69af3e06142869456310dcedd04f3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=hanuman+chalisa+pdf+download+telugu PDF link annotation
    • http://parmalab.it/userfiles/files/jorosef.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///50182548646.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/63659354797.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04f74824d---44334404047.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/94313905889.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109100458346531.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fufipumotemokali.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/gibibogibidokirigi.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/95318068099.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/noramovaz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f75132d5---vozuxomupogepumiwagoniwoz.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/lafajakejulebexukaxedone.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd2429ba3---46091188138.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/guvulademugifuleder.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/posanafuxunomosuza.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/52966876335.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/66783564245.pdfIn PDF document text
    • https://casaalu.com/luutru/files/vefelijifi.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/senigawexuxabaga.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/72538338854.pdfIn PDF document text
    • https://esz.jp/img/editor/files/kaxijidumonikelikosudofa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 1992 bytes
SHA-256: 3b239dcc4153b2f0815c4b5c6d92f2559b73ce1cb939ae4eb36d88c9ec3f9124
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16316 bytes
SHA-256: 3e98607220f92ac0cb2f982719ad2ebf7256d160d07b11cef724d14226686ee4
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 11144 bytes
SHA-256: 6a43fa10ed56031130c461915c48c0f90cb1d25d9ce4a14a6af9e12ffcab902d
font_03_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 27644 bytes
SHA-256: 12360d0235bcfd58acad4b7f9b44d2dcc2f67c99742532fff3cf453d7241ed17

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