Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d0794fffe4e0ea…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 17:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9249121e292e2e052d7fb5522ad4d659 SHA-1: 02925eeb9c8b0356a9200498c58c2717d223f49e SHA-256: 34d0794fffe4e0ea1403bbda5afee864210c4669724f3b083781e23e0d0a81f4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which host further PDF documents. This pattern is commonly used to obscure the ultimate malicious destination or to distribute phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://loveperfectionschool.com/upload/file/panorarezuru.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f349247aba---ludozazusodixefo.pdf
    • https://varida-tech.com/ckfinder/userfiles/files/82622803492.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/luxit.pdf
    • http://darslaska.org/ckfinder/userfiles/files/ranufamo.pdf
    • http://knipia.com/userfiles/file/fufosobedigabusopo.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/ribuvepova.pdf
    • http://tandartsindex.nl/images/uploads/74942524344.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb3651bd7---nufajuralu.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6r1ueqm7mgtf5g216sb3i09mp1/71809793848.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0d70c8a7---kolivamajumaki.pdf
    • http://beergolfers.com/blog/images/file/kegigavufawopin.pdf
    • http://bienchidan.org/uploads/files/kezusumufevekuk.pdf
    • https://sofupingame.com/calisma2/files/uploads/gajimozitaxupavupes.pdf
    • http://ccforum.kr/uploads/file/1631277871.pdf
    • http://positiveforce.in/uploads/files/xeweledalanulomirunedo.pdf
    • http://e-district.org/userfiles/file/87684224518.pdf
    • http://all-premium.com/user_file/files/53773525476.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/60267916120.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdf
    • http://mtreurope.com/ckfinder/userfiles/files/kadorigu.pdf
    • http://kajo-frings.de/userfiles/file/9629607183.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/dowotod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=red+bull+bc+one+apk+data
    • 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_off0000d174.bin
3175762bf89ea8f91bb785ea7108017d439ef88ab7111d06127274d9fcdf69d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 20060 bytes
font_01_sfnt_off0001063b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 16792 bytes
font_02_sfnt_off00011e52.bin
f84f193962f2087ca63b883a80f21bf6e7833923a43d87d19a7e0150196d87a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 10524 bytes