Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f80b6e1a34eb4a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 08:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f8bb1172f02b903cbf8a3ee2d26542b SHA-1: 2c46b3d86022c532e4aaab9b156f39dde4623d32 SHA-256: 50f80b6e1a34eb4a2d3083f9e22a263561f2f335d3a276c412c458781e123048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+keep+emergency+number+on+android PDF link annotation
    • http://change4best.ru/upload/file/61826017360.pdfIn PDF document text
    • http://orthopediedelft.eu/files/34241882099.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/16124311012.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://12shio4.com/contents/files/19263582498.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fovogu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d30692093266f5663883f04850dadde0/sorelixa.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/50414240268.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141ace45b7a9---88752724856.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lojur.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/80792253846.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/mijitagiboxewa.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/40366121180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316049c9f2c---vudijefawedumineselitewiz.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c0106719d01d626327ee011b25710038/36345880343.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/10319507834.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/moluradijugumivena.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/14002992285.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbcda6585---bakasejuvalowemaliwuxes.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210910203227.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/20119136617.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ffe4fa5c---59779290643.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/mafiwiverekutasapis.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/zujurudotiporeduz.pdfIn PDF document text
    • 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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 11168 bytes
SHA-256: f8a073dc3abc6712c3e1b9ca99bbcc0e77f70c90ab6b51681b279ffe8b1da59e
font_02_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16220 bytes
SHA-256: b32a64a57b91cbd6e4ae747fb8e79866b23c601ae5331f150fc739eac6a0348d

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