Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc25bde2752adf74…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 16:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69232f32a0539a30f0b235772186559e SHA-1: 09c431938927587b90d2f26ca631c0d7e4857a85 SHA-256: bc25bde2752adf7484abcc49e37ece455f888570ae61e73a73c56b3818ab6be8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to lure users to malicious or phishing content, likely via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b912db16f205c8ca81c912fb5782a151/fadixaxalilowuxok.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d5a086f4---wedomiserutorem.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/10fe1e0d6782c166576da6127b7ebde5/gagin.pdf
    • http://xboxheerlen.nl/userfiles/file/muxepomujexilowazeverup.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/983f901aa88b8b5f097dd4f17f342727/bifitotevikotifo.pdf
    • https://kaptenhoki.net/contents//files/61236101818.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9jotmo5vqmm281bf8jg6albbp5/tixuwebuzopaladu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b551b195346---93167665438.pdf
    • https://bbmint.com/userfiles/file/50528049161.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/muwibugigenijep.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/junijum.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4daa797eec7f7ee3952babcb71efdc1c/21190305969.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c1f37aa2b1bb347888e1e6d8c387c171/16299862853.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/rubegubuwewopilibadidaza.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64263dde37---suwinifexokozulug.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9c81ac05---fomikusuw.pdf
    • https://bd-sokolovska.eu/userfiles/file/43802189029.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70ea4245d6---nexosirijotuzixedu.pdf
    • http://suamayin.biz/userfiles/file/munisasun.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0754de383c---3442352934.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd3fb85b2---66453946692.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09961e8ee4---sulaveruwesidu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bleaching+100+polyester
    • 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_off0000e74a.bin
a9eca3ab3c27db37a45c3e0d61afecd11b6b8147c1417494dcbf0e77257788cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 17804 bytes
font_01_sfnt_off00011599.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
font_02_sfnt_off00012db0.bin
7cde4e4aa9a43b2e28b16bba9cd1120a57a64d1002f5dbc3cfa65e8576cd2471
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 10992 bytes