Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66f3a74e5255157…

MALICIOUS

PDF

70.6 KB Created: 2021-09-10 09:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06e1f50a4122fa7980e17655e862f765 SHA-1: dd6ee20ec0789b1c59a5db4cfb1f9609e77634fd SHA-256: a66f3a74e5255157eddda96eb7a7723d0874f83dc953c044f986adc3efedc93d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The file's structure and link farm behavior indicate it's likely part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5265

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://konchris.com/userfiles/file/1630770961.pdf In PDF document text
    • https://k31szmq42-nu28.com/contents/files/wonapabegoranisojaw.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kodevoxupajijejazidubixag.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/38978633852.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c4b79630---remikodotitixedawesi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130371f8b06c---53950506235.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/xexulugotonoxijor.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/87883617599.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/salufivabipev.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/22629974903.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/13689725558.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/87681346904.pdfIn PDF document text
    • http://dentherapia.hu/files/file/molokojugemusep.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/14387336012.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/48765259002.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/ferosusawu.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/bexaxovevalenunapava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145ca72610---23538199051.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/xijomugi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gufijemetobudifel.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/89991650128.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nitenupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+play+games+gta+5PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 10504 bytes
SHA-256: c4a79f8547e448ea02df26899833d6eab0107bc5aaeb1bd758785772f81e8b82
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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