Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d1c92144a1235c…

MALICIOUS

PDF

80.3 KB Created: 2021-07-10 08:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9f41a879eb00623caf1bfa859c11259 SHA-1: 4579bc226c1496f4223f582490b1a3eb82ea558c SHA-256: 53d1c92144a1235cbc86939edaaa1e0d551fcf3ade2798b8acc9d5c2d533b427
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=west+wittering+tickets
    • http://lorichphoto.com/pictures/file/91329517409.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41410765a---doxutinivifuk.pdf
    • http://atenngo.com/admin/sites/site/documents/16265021482.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160856dfc56273---mafabam.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098da56ae183---xubatubevomelokigoluga.pdf
    • http://www.asslar.de/downloads/61280505827.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210706_8A01DB95E373425B.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbbb8ffac---10448986113.pdf
    • http://efuturesthai.com/uploads/files/rodorukidavujar.pdf
    • https://primer-spb.ru/files/files/pobumaxujerupofi.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/n3areger1l02ljhh3sph3gve7m/24246172757.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7f171fbd---nigegase.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ddf9f38584b597caf6d319824af45f92/52049073240.pdf
    • http://ouhkpthaa.org/userfiles/75118006144.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/s5gsuqd6k0fciid8o4odv64055/17321366400.pdf
    • http://singer-island-condos.com/userfiles/files/kijij.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102a2ada91---10418274642.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/79a6b0a766cf6fc1b68b47c3fe63e14c/saxudaxafofurijised.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/wisuxajuxomubo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843957e4339---zefefonasoxikutasu.pdf
    • http://stevis.cz/files/file/tabumupa.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f44143fcbf1a7dd08e45455e2ea0b7df/pitakonuzevixezag.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba837477f6f---94644777623.pdf
    • http://cobbpaynefamilyreunion.com/clients/862770/File/saxisebipirujuxoti.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_off0000d73c.bin
a8ab1b15b6069194cfed0186681b5a65cd4220028c3bdef1b8c9b7fdb78cbf00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 17384 bytes
font_01_sfnt_off000104dc.bin
2fdf2d09ee76507ea796834f35c676ca5b8a77e905fed961c19bfec257ba7f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10248 bytes
font_02_sfnt_off00011c17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes