Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f945a4796beccf…

MALICIOUS

PDF

92.5 KB Created: 2021-07-21 21:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 113ef7f72270202e0dd6dc7468342e8c SHA-1: 330128b0bfaf2a91b971eee41013cec38f36b986 SHA-256: 87f945a4796beccfb270759f5d2686495878cd1772cab994eb365a42b7028e18
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://clair-environnement.eu/catalogue_dynamique/file/94063869659.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b9db8ff8e27856d65b67008ffc2aa240/71334324506.pdfIn PDF document text
    • https://telenovella-bg.com/files/guxujezuxisadok.pdfIn PDF document text
    • http://hibertek.com/image/files/20210702_072100.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/m8l87las8319qtvk0kmne27o20/54483486476.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3660192ec7---64339936922.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/7gaijo1f211g4imrjgotr31keq/zexafalikadakuj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ebd2a174f---61931030877.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c21c309e0---puvomenunomife.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/58999048591.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/difajofanojapuxo.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/662092c5581815f950137f922d48b013/vojape.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e829420e---fetupixafawovenisumegim.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1tt8eolo1sls4o894jc43oiq53/zunegojugegixalixawi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/64511473501.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca000151b06---39055763268.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/256508ef623ce22fb957e36819024254/6690434008.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/mudesatodanuselevubonejav.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mumalasanadodexefepaver.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a0fe57882bec441821823428a5c37ae0/72866664314.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/livew.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/55810437887.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/19339569277.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/gorelafarad.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/53950024606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+many+24+ounce+bottles+make+a+gallonPDF 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_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 11104 bytes
SHA-256: 894fbf8fb33847a4f28d3c836c4b957fd5512af31c95c8a8b92cf25881dbee2a
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 19516 bytes
SHA-256: eac4340362fe8c4e162da6348ecf51f9491c677808c87550724c0bdea03dd034