Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b37acd752d1c2d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 16:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c64612b71015df40ad1cc789d282a33 SHA-1: 72cd303b0a882306c3d451d641bfbf07ddfbbb7f SHA-256: 93b37acd752d1c2d0db85a214437ccccecb1d08226c88e6c9bc639b753e2f4b9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting. The presence of 'utm_term=among us download game' in one URL suggests a lure to trick users into downloading a malicious file disguised as a game. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bolt-go77.com/fckeditor/userfiles/file/95227413821.pdf In PDF document text
    • http://style4.allwebeasy.com/userfiles/files/vidowuje.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nezawinawagurevu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/sebudilidadevom.pdfIn PDF document text
    • https://pokereshop.cz/data/file/suposenemumeximun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b688817aab---76634528109.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/18626005134.pdfIn PDF document text
    • http://ombs.ru/uploads/files/mixanagatofepuna.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0b90a1462d2d970340b3122144d82894/23673061663.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/kumumonazusorojetujedarur.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/27325511504.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/12123930620.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/dulufigiru.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94853338606.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210917_194725.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/bajuvaxizoxozerokupufuga.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/58966423617.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/34653792875.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161304c3e03db6---59439399808.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tenis.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/l26dvcksvmd96kflrp8v0a6e0n/61801397065.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/11666688559.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/nisisekijafaxogaloz.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/lapinakebodojijibutemin.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k98ulvcflqntimm3bkt9fnq7f6/nelusamugadajowo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a4be24310ccf152b1f8bf00d1f04cd94/safax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=among+us+download+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10468 bytes
SHA-256: aebd225665cbc67658fb732dcb7bef81195d0d33f3d4a8e8d899d649133baa6e
font_01_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 17544 bytes
SHA-256: 82fafcefef06c0e4fb84f10f78155d1a3be6fc32413ed0a3a5c7e9de51581a0d
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1