Malicious PDF — malware analysis report

Static analysis result for SHA-256 f745257d8445f97e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 22:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f36171ad38805014492deb9126703eba SHA-1: 9466b70cb00699b6404f26b341456a5f6bcb9dd6 SHA-256: f745257d8445f97e455a0295f9896962d5ff6eccbd665b1a47a15619798c91ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on disposable or potentially compromised domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://geometrarontani.it/userfiles/files/kokedalirabimekerude.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136de6c10edd---25851114305.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/25966937717.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/nidedewirujikuvisanasijil.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/58615420580.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210911011329.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/33344154286.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/ragugivusaje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376689a16e4---tototaviwomab.pdfIn PDF document text
    • http://calisnt.com/uploads/files/69777025636.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/78904131324.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/migag.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/47785480156.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/nixibinaruwidi.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/pazunudasojorupijananaxe.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/pumuzuvonikasi.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/13733076513.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/vejorupaxozan.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/denakudonibu.pdfIn PDF document text
    • https://bliznacite.com/files/dekelasogifim.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/robufoneriwixoxunive.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ano20h1vb4lkt79ffcqdfdfgn0/nuwufaw.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/korafoxuvatiger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=running+apk+on+macPDF 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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 10408 bytes
SHA-256: a557388c8034d79c95b7a41a96424c7821080acede88297d32a6058114fc3371
font_01_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 17804 bytes
SHA-256: f6aaead03d584f65f73ce189bd16ab3656f5e16fcebd6a78323494bbdfca2aa6
font_02_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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