Malicious PDF — malware analysis report

Static analysis result for SHA-256 772f1e41eb37febe…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 07:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6f048b7753ef81c7f6ac2580b2d9905 SHA-1: 6763825f414d6894003496ddc33a848f06a2d23e SHA-256: 772f1e41eb37febea3f8182c70b0907a4f970e96b59f771f6ce03b0ec9d8f646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, potentially exploiting vulnerabilities or directing users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vekosgroup.ru/userfiles/file/vojatarefoleguvetujegu.pdf In PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/mefezefinoregalevudajotad.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/jufigo.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/17344494485.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/77499026244.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2f3bdedc---begapoxobapifefuge.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c327a9e9246da480b1d466b5b158798f/33257947658.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/4771405319.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/96869707948.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/84717783920.pdfIn PDF document text
    • https://loctra.net/userfiles/file/66355824972.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/16056495312.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b002514f5ecba2eb4e264839eddbc66a/togofiwoxatanoneraso.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760ed42ad8---43427230155.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd59aabf3---fegukakosoredegudimataxu.pdfIn PDF document text
    • http://turatabor.hu/media/xitenemuku.pdfIn PDF document text
    • https://makenie.com/upload/files/ditalumibejezikadonusafov.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b22591f275f76ae571d1eda8d27da8d7/boketenoxoxapuvafo.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mirifux.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/60048932236.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/devizuxodomabamup.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/jezirebikogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=games+to+play+with+three+peoplePDF 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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16860 bytes
SHA-256: 5a10d68f17cd4087d7cbf23e51d395fe83f0723c7b0b3ecab0f7f17556e0ba61
font_01_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 10652 bytes
SHA-256: 2a1918652d4614d4f1d5cd85a1e70da4ccc1a0f01ce135151cb661802d2474a0

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