Malicious PDF — malware analysis report

Static analysis result for SHA-256 36055e7451df8105…

MALICIOUS

PDF

82.2 KB Created: 2021-10-09 19:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16f7eff9ef38004f2d5801697cf3faf6 SHA-1: 07757a46dae66c6fe6c3afb614b4700946d07d99 SHA-256: 36055e7451df810529d57cefce9aec26b0a313cfab747087f385ad7d52db9105
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of small PDFs acting as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fpole.ru/sadm_files/fubegevimuzasajofe.pdf In PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/1019436979.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cfe25d7---49534094268.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/42361449646.pdfIn PDF document text
    • http://myslizdrave.com/soubory/sobomominirofuxerodafa.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/kopawikijawusuvifumi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/koqlbenkngi2podfqq4c8a8u94/66515655629.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/ritofupigoxoxobi.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/motokalemevudumarudeja.pdfIn PDF document text
    • http://elitvorota.ru/f/file/88458936526.pdfIn PDF document text
    • https://blugarden.eu/file/wufivexe.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/fimowetatorumujovoromevip.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/suvabusuxixixikewipugil.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/texusokupugid.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/63298790895.pdfIn PDF document text
    • http://webhoctot.com/app/webroot/uploads/files/zetinebopajuxodetudaredol.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/84771128742.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/54084068892.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/notokamudezovibufot.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/pelalolikozulusekopakux.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/79117156347.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/98446090768.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/59143795149.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/25872968229.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6b4ed9694---53073750867.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/61372244884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pigs+in+the+parlour+pdfPDF 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 17916 bytes
SHA-256: 24c3ed476bf1dd5afaefb2e4b63b64c39c231f2fc3ec3b572e1129ba38e63650
font_01_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 10880 bytes
SHA-256: 430da97714c51c1701bce0399b6c0032ece6e8170133a5168375ab1ec39fc06b

Open this report in the interactive analyzer, or submit your own file for analysis.