Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f3e415118b278b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 21:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53c7e341dd8cff9753b38ed256d278b4 SHA-1: 4a42e3c7e3d642da32708db49687457bcd6b1d73 SHA-256: 34f3e415118b278b8a0c10f5b56ed58a1d3334a52cbafc85d000a3ebf5e6b551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the nature of the heuristics indicate a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=minecraft+gameplay+gif PDF link annotation
    • http://vincentianssjp.com/userfiles/file/kuvezu.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/sukolobamigugonakujuja.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/768990a13f8b0d4794802f8965a5b5d9/runanowonerogolawo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/97331530115.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/aqr2a9hq6jlq6ns9tbd1a6gu00/56228912493.pdfIn PDF document text
    • http://dhf-china.com/d/files/sobagulobokota.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7b3afefd96582f4fb2bc8982f0adb471/55324584279.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080349257423.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/wisewatexomup.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/bixigiminaleso.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/93589453243.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398ce225ea0---52933441818.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614101a947c9c---87562187241.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/juxitofozipuvavazose.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/pibavakipimisefurat.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jefabifulasaw.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/fifowotokumevazi.pdfIn PDF document text
    • http://anpharma.net/upload/files/35590533423.pdfIn PDF document text
    • http://hidropro.hu/upload/zinalu.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/77975922022.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rugugujopobiwirezi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5aa49c8d---goxukufupo.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/62900356287.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v6iic6c13qd777etib408r0dr7/47469171957.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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 10644 bytes
SHA-256: 5bdf81b5c35230023cc9dc6a802305d585eace0f6a6cef1bc711fb74362b6f88
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16660 bytes
SHA-256: 4fd610629001fc612a63314c523c11029fa684900a46ec681ba2a0fc55189ace

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