Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33d500b5c34809d…

MALICIOUS

PDF

81.2 KB Created: 2021-07-21 08:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0a7952227dd62e28eb7db69e2711469 SHA-1: 9105032e746b382a8e0d733f65e90124d957dfe5 SHA-256: d33d500b5c34809d90fc5df0e895ccc91d1fd24c80dc7792cfb0ba786b27280a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms hosted on disposable domains. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://ty-universe.com/image/files/20210617_213251.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c3a82488---rufurarelenewo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o5f3pn6gm8tqimfgasliiqrajc/4806421753.pdf
    • http://pogservice.ru/userfiles/file/dolapipekufiral.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc949e80c---26788758552.pdf
    • https://tiklatakip.com/calisma2/files/uploads/2730416297.pdf
    • http://komputerzagrosze.pl/userfiles/file/nikopexadiwopixofa.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d1d3ecfbd---90683290906.pdf
    • https://rosycaffe.com/file/zalagezenep.pdf
    • http://gidaero.com/upload/fckeditor/file/96594120279.pdf
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/62881527774.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb9169063---wodazapusidof.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e08c97fc8---4878157868.pdf
    • http://daoltrading.com/userData/board/file/tudibelulepujasari.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dd6be8d15---26250312003.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+a+catfish+a+herbivore+carnivore+or+omnivore
    • 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_off0000db8d.bin
c0399bd08a2cb213b1790a974a133e25b1c250e22fe9b0ce2d76190d82da46d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 10712 bytes
font_01_sfnt_off0000f3fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 16792 bytes
font_02_sfnt_off00010c10.bin
5b1f026cf0f74840788c3bc75bbd367ae879c7decd3416eedb10258562e139fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16908 bytes

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