Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e491ef09e220ba…

MALICIOUS

PDF

93.0 KB Created: 2021-09-01 04:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3db372a156001dc6ec8dd1b91609b5f1 SHA-1: b6fefd184e673a79d77648202c8e277e2c2dc220 SHA-256: f7e491ef09e220ba9ebde2031d539e7101a8f31492d71b77b05f9973f78c1671
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The file's structure and the presence of multiple external URIs indicate an attempt to exploit vulnerabilities or trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://ketchas.ru/uplcv?utm_term=monday+funday+song PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1fe09e00a4324ec5d0191ab315b27c53/46185852289.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fopetubewodetewe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/95827954889.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d01cfc52---serulanosuw.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c57fa23ffd6d98edb651f7dd1c699a0/85275349218.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e09be9b41---jomopelovurokegagakab.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/28347273514.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/suroxabupixikotok.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/32886413148.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726607914ed---11015554617.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/8896080367.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/345051a25a65427786b94fd08912b465/tisupufodukikawulov.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/banuresasot.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/gapexogo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086755455977---15636264373.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xijujarixar.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/24633778845.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607100663cca0---sebuxepeselusobogawupofax.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02eabd845---97701813475.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/netofulinanoxuw.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/87734677844.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vexojexogozomukokoripu.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_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10268 bytes
SHA-256: a7544b706f6f86eb698ee03a081910f4fddff5977f7aa8564f21eca67e192200
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 18896 bytes
SHA-256: fc43415a0c0fd2fcb61c068ebaa9e3f95e75efd5008f75f09a6cae4f8ed8d2e2

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