Malicious PDF — malware analysis report

Static analysis result for SHA-256 0442728866f14ba7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 05:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c71995edd89197adf43207d970df077d SHA-1: 89e48a839494fb0851e57e3beba94a27c849ff64 SHA-256: 0442728866f14ba7b38e26fed270e9895bc3e5486bf7f6ccf3ad7a6d8ef1f79e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS platforms. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=name+some+harmful+insects PDF link annotation
    • http://studiotecnicodambra.eu/userfiles/files/8224495882.pdfIn PDF document text
    • http://qzgj.cn/upload/file/tipinona.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/1450459240.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/8811345970.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zuwoxifusebebu.pdfIn PDF document text
    • https://melz-feu.ru/upload/40679210533.pdfIn PDF document text
    • http://mobil-tech.com/files/66976251353.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5efa3d4f4---32483862467.pdfIn PDF document text
    • http://tencanpowder.com/d/files/84953115495.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/83748305892.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/61279393807.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wefadibajabixevixujomobu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3de7cac7---dewut.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/44097732981.pdfIn PDF document text
    • http://superazs.ru/images/news/file/xajewaxilo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/51c2b9738c8a2dc01d88c4c6d7ce8350/zagavojepo.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/puxakokofudekufufexim.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/36983333078.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416cd87e28---remojasanetav.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fofulapovexowuwuguwigi.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/wibuvosejo.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/51126928792.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/jafivuwizifugiva.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/15793451994.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/lodekuwosuzamivu.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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 10676 bytes
SHA-256: 28c200ad4dcd6e2e2c4fad53128145e13463b28dca70b5179a8a56613e20fe0e
font_01_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 17924 bytes
SHA-256: 0db257fb5e6766915aaea6bb0d492a1cd46837e6de2fc4ed42d471a29487788d
font_02_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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