Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89b2293e4523dd9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 18:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc6b894cd39c39ad06ccc07de64e8d42 SHA-1: ad3ad6bbc09f36296c832c7110f91dcfae95e61b SHA-256: e89b2293e4523dd9da1d6b9516ffae209c1e0d9c76c459822d3273a89352073b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://jahanchart.ir/data/files/file/52707446328.pdf
    • https://gesema.com/UserFiles/file/31492044801.pdf
    • https://marathonblainville.com/userfiles/files/duzevomebipezij.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/stdf3iamornp819udns9ke4jt4/luvegojokotaridoli.pdf
    • https://mogilew.ru/userfiles/file/19046747696.pdf
    • http://kronospan-mofa.hu/editor_up/70791214984.pdf
    • http://aurora-c.jp/files/files/zepitabibelujiviza.pdf
    • http://amirafouad.com/uploaded_files/file/vitozanomamutekogoli.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161312b12053cc---40877544456.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140eaa46f61e---jesapofu.pdf
    • http://jr-bang.com/uploadfiles/20210902011331.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/77431952702.pdf
    • http://ventima.ru/userfiles/file/zivusowamovexerezasu.pdf
    • http://boldogelet.hu/media/46023570168.pdf
    • http://dobrasekacka.cz/userfiles/file/26933422936.pdf
    • http://hoanhaochemical.com/uploads/files/83228693739.pdf
    • https://gullyracing.it/admin/ckfinder/userfiles/files/maremogakosiribetumukipi.pdf
    • http://wangguanhardware.com/userfiles/file/dokazetonudobaj.pdf
    • http://music-summer-courses.eu/upload/files/gumisafejikizaxediwawiw.pdf
    • https://suncables.co/images/file/pitaribaxasajoxadaluvuku.pdf
    • http://85560891.com/upfolder/e/files/20210901140459.pdf
    • http://studiofantino.it/userfiles/files/puwupetusa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+friends+season+6
    • 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_off0000ee22.bin
b0fafbf835a7b8e5e78787ee870f5c49fee4641e929318b07bec8ff644bbbd0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 17872 bytes
font_01_sfnt_off00011d0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 16792 bytes
font_02_sfnt_off00013521.bin
95cd3f4fff94245f52c0688480b91fc56b7c5581eec1c2aa68d12a07674912e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 10688 bytes