Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44f1caa2b8c8bcd…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 11:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ce0fd26e749ac23c9830f25abcad3ba SHA-1: 2bda3d9748228033c0fc61e7aef56d73285cd0ea SHA-256: f44f1caa2b8c8bcd355964676f4d48b7b961f15ec815a42c0e78395c8cce0b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=download+pes+2020+full+crack+kuyhaa
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/fd7f512179e7c3f8e56008e01af987ae/45892480507.pdf
    • https://mmszke.hu/files/file/simalo.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s0a1t7ocp61234tpmcq8h9ib95/nezavemonabu.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da100640d4---68672847045.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cd9472bb---40371035456.pdf
    • https://atraba-holding.com/userfiles/file/bolasi.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b38df8f5f14ac814a65dbcfff1b8d9f4/nokuzelokodatimunubifun.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c67db3cc81560aea77a380ad89132e0b/turemevuverelu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086b33d4ebd7---64668425221.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc49e5616---30080151952.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/006f7c776c0baa4beb8026dfe482cc31/82669234966.pdf
    • http://hiddenforrest.net/clients/76790/File/faxowikubag.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac566f897---dawowowivesapefenujom.pdf
    • https://vibangnhadat.com/uploads/files/sapogijawabifunape.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9grl70ta9uucgdmfo06gr790sm/48741105538.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807ff4971d6---zinapoxukamukimubiva.pdf
    • https://atcotourismtravel.com/userfiles/file/78299690025.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/58102908633.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/02c3ed03eb740f03ff25232333193690/66110906893.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607336dbada8a---mopawe.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0837171a37---22794585085.pdf
    • http://mu-rrrc.com/userfiles/file/nevisejonoxexevomafiruxo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28e.bin
7de5e8f0a04f2a6b8595c90a0321d89b40b8243ea0a57021e2fdd5355e66b1d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 18148 bytes
font_01_sfnt_off000121ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 16792 bytes
font_02_sfnt_off000139c4.bin
326693902822342f6690817e60b4b22fec5f95197563d6598ff9b8a3ff00e18b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 11160 bytes