Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dfe7b609089e53…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 01:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc8650cdccc00752a6e09f564fdc264 SHA-1: 33c8f92185cb986fe6245c50edd52cefdd1e51ca SHA-256: 83dfe7b609089e53b6009d8aebd1867e8a8b751504718b23c33ffd623cf4d8bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=mod+avakin+life+download PDF link annotation
    • http://mtt-association.fr/upload/file/53149574384.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/69273102528.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/79263841834.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/27402816952.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/bekopizibilozer.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/40807827985.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e031c6213d2a5019d6817159a1ec7918/vegomuxewi.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/lovesafukig.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/tubisotexokemokutesutiw.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/visasomivunafobi.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74645034840.pdfIn PDF document text
    • http://arucax.am/user_images/file/14788159701.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/taxiw.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/vezupalokiwujirigogular.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tudilusodesigovejik.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/kusoroguvizodesali.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/xexukolologokinoxarotep.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/noximafijiz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9d3e052b---64347739359.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613901d148494---mavemawumipazikigagan.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/tumerotepixudu.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/85536953929.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/latafovegewetomowi.pdfIn PDF document text
    • https://digicpictures.com/downloads/fitawunawiresizatonevote.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10220 bytes
SHA-256: bc0f2a7865139c159ab0d9fb97e28adcaf966b5628257a4077e7945d298ec83f
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 18092 bytes
SHA-256: 72241660ab1f95645a1c36c55813bf1185f4bd1edc1d3d2309fa410fad547c48

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