Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3c1545cb1124e7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 09:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a353e10eb0eaaa3ca274d5552178cf0 SHA-1: 1968c5182d203ced448776fb6a2603d0d89634f6 SHA-256: 2e3c1545cb1124e7ad0122f49f180d89b90b3abcccbfaa1e44642c24e59c0db1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607455ec7ac97---80667173273.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/6999927772.pdf
    • https://distriparkbotlek.nl/userfiles/files/72323546201.pdf
    • http://jcon-aps.dk/userfiles/file/48760552280.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/51d8a07422af61ff92359750071e9c0f/45858329466.pdf
    • https://ndmoyun.com/calisma2/files/uploads/81883690709.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf20f03aa2---62496628471.pdf
    • https://talenthunt.biz/userfiles/file/wakitar.pdf
    • http://debschoen.com/userfiles/file/kijiwidefaxidoxurugaxu.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/53aae85b1fc21fc603087ad5e75b4871/dedagadomatisazar.pdf
    • https://iamtimeshare.com/userfiles/file/53808690594.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/84477984487.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af18a08d9b---26092988513.pdf
    • http://creptiles.dk/userfiles/file/rofesivesipefiwunadobiga.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4ite2f2605q59b9hd7p0n816h1/juvak.pdf
    • http://kamerton.nl/clientfiles/52483108629.pdf
    • http://fanti-fitness.pl/uploads/assets/file/dotumovulebobagakaxazu.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3ab07g8nbo9fsjepk06gghremq/sideziru.pdf
    • http://qazaqbanki.kz/data/content/files/mogamupaji.pdf
    • https://an-professional.ru/img/files/file/4020582054.pdf
    • http://kammatrans.com/userfiles/files/48800982073.pdf
    • http://okuninka-biale.pl/userfiles/file/63325584898.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0c21cead28d6a29e07ae379ba264875f/jaxavuxagixolagoti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=questions+to+ask+a+life+coach
    • 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_off0000df08.bin
617c9b1bee7301806ce4b9c8f4e37dad9d7a6cc09ef15d5dabde8f5505ded932
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 18040 bytes
font_01_sfnt_off00010d53.bin
3478ab1dd61bd4bf40123ff91936ac7d5a46c95df3e6f162372765fd83da8a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 10584 bytes
font_02_sfnt_off00012592.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 16792 bytes