Malicious PDF — malware analysis report

Static analysis result for SHA-256 6038cffc5a7ea9ef…

MALICIOUS

PDF

87.7 KB Created: 2021-07-22 16:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b1c3b24493603df7c9979634eb38cb0 SHA-1: 375eb0b604a878d8a4cde668f926a3760845c941 SHA-256: 6038cffc5a7ea9ef26c087f0be7568dbb14ce875c06e12f100217613b261a773
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The document body is unreadable, but the presence of numerous URLs, many hosted on disposable or compromised domains, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17eaa1f33a---gipezenogevujivil.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9bef85922---37701465794.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/46596949910.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb712447787---16279996887.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/dewikitanudas.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/folutaxunerupodugebimupe.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/af3a2710b7fcbf50fd98956caae2ba82/56701018006.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede4aa645d---24821579468.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/xopojomivawaxexo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4537a9572---gazexubebuvowol.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24496889396.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a9a41f059f3e0e2c274fdbe952003/14579775617.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/858d9cd5ba85ad254f1c6a4c20b52481/dilunazalogedaxojozuwer.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/patexasasuv.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/559a08c823a3ec202905955715625895/68649337835.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b808cc6fd484b8cf83e96cf83524be9b/zevelifeliwevavafu.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/lufofogodegevitawisaw.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc974736489---tunojinapepofukagoruzul.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/13669818594.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2a906678f31c5a5a7204f34bd78c4310/52303412699.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a734bf05404---jeduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+tony+dow+look+like+nowPDF 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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10532 bytes
SHA-256: 030e35cdac8437f615aaaa7d51b18ceacf4b94daa78108e17c834549f611c250
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 17224 bytes
SHA-256: e04f53b0d099af670644aba006085af11c47b25143af40dd1f4a9331d5a9346c
font_02_sfnt_off000137c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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