Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f821734f563e01…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 17:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 548c64943599f4082bf2e5bb3e4e41ed SHA-1: a56500ae00841af803f6ba87bfcf3e687033f626 SHA-256: 85f821734f563e017a9c8492aa17ec2516fe8c5e57ac50aa22463df9dc9d820a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially compromised infrastructure supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4017f824df---tibupidixifolos.pdf
    • http://raczcsalad.hu/files/90337080478.pdf
    • https://noddy.nu/images/file/fuwojaj.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c751ca08969d07c2e963291213b278a4/xobelipi.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f3c79260---16865600511.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb5ac5aafb---6234818770.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/sonaje.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1187a95c17---31852950991.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/92add79f42ddfd6ea47660fa7ba90eea/valajuxopalon.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/podunezasi.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/kugolepiwefogagamit.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a044f55b---6633869477.pdf
    • http://roocenter.ru/upload/file/vikok.pdf
    • http://simonhoirup.dk/userfiles/file/xuwuwifusapefit.pdf
    • https://hbphoto.ca/resimler/files/bamefisevetejulimupunazov.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cf0350b18bbe8c6ed6b06af0ccd3a6aa/waganunomipad.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b9195e24---43983147525.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f4a21377---zelavotolofavomalumifil.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/af8c2dec96f8c4d6049c2043e0eaec65/kopoko.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/987503b281338e8f3869ad6d324ef45d/38598083141.pdf
    • https://nevisnews.com/userfiles/19847595023.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/79a82326490f2e12f4fdaee0049570dd/25179208942.pdf
    • http://coeb.eu/userfiles/files/42246412115.pdf
    • https://swalaya.in/userfiles/file/71064641291.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ftrqfnnvnbkvjikp6qfeinve37/sonaruveped.pdf
    • http://asja-doll.ru/userfiles/file/96148458577.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/zisaxagobosanowe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=discus+blood+pigeon
    • 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_off0000fb38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 16792 bytes
font_01_sfnt_off0001134a.bin
e9c37c49a262f193eb2ce10afdbe2cd4b5aa8f3ad516b9754849c95f09d03580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 18732 bytes
font_02_sfnt_off000143ac.bin
64b5b08e1f84134221e9aa481a3fe1a8faa5a14603e66120b8c955d59b17ae58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 10568 bytes

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