Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd36b99ba096ed8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 20:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4fe9de78986c2ab73dbcba1d767874f SHA-1: db3ab09c1c1e10ae242cdd1c300b940bd1aeb526 SHA-256: 0bd36b99ba096ed83a46bdeb4c0a92a7635690ac069e840584f4f946a48ff707
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://farmaciacogliate.it/userfiles/files/pebagoso.pdf In PDF document text
    • http://www.smartusb.info/images/library/File/falewipezonobozaguze.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/94738201161.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/golixugez.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/gotufabazisofizo.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210918_81E5D2D7459515A7.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/weninobividuxutetitib.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/xotogif.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f47b5781---19747621739.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/92359e343a7efd6430d1fbc9e9685d31/fezetozisolofurixebojul.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322736e7b53---75138395140.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/21920073987.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210911_98692.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/kifavebaderu.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/43633552154.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139602fc8eb3---lufizive.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/jevozoluzep.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/mijiwavajasesutolom.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210916212225.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/vuroxiwuduxumevukojavob.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109132052406246.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/38847932152.pdfIn PDF document text
    • http://tochuchoinghi.org/files/29622299280.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/vidazijewujami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=anatomy+and+physiology+for+physiotherapists+pdfPDF 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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 11040 bytes
SHA-256: 22e2c2cd0fcc0f862757e3e6e738eda535cb7b285b5a93e802cee3e904050b39
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 17176 bytes
SHA-256: 288c99dcb50a36b5dcc5bcfb34808b4c8a17c47e16b2222a63c7079589aa0ac8
font_02_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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