Malicious PDF — malware analysis report

Static analysis result for SHA-256 283fbdb3815ddef7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 20:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d64798001316bad5fbce923578da23a6 SHA-1: e71855402f277e827d0da30b121688210f850b61 SHA-256: 283fbdb3815ddef70e7db39f0f6ccc057ff077f3e8167b16d9c0a33385dc7688
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the ultimate destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://essaidafm.com/uploads/FCK_files/file/widiraguvinaj.pdf In PDF document text
    • https://evergreencans.com/userfiles/file/lakimuxerujidofelikefab.pdfIn PDF document text
    • http://sun-eko.eu/files/file/lubofigazejama.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bijotilukekodawowag.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96291789223.pdfIn PDF document text
    • http://rotang.net/userfiles/file/59427986468.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/36137132342.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/mijasuwofono.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/70233206067.pdfIn PDF document text
    • https://mashura.co/userfiles/files/33180876604.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/vomamis.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/dupobetox.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zeladasokogozuwanebewuwu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161321dd94713c---bonoduzopufevoriradapexi.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pivelejafesumowimufasin.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/sigomololuvop.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lotapotax.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f6675fdfe3733dd285e227e1bc104dcc/67824468813.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1703c45b---54269782527.pdfIn PDF document text
    • https://mytopics.it/uploads/file/42769623881.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/duzezaxiwaxurikodi.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/daruwovakadaxojuvogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=words+that+start+wrPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/jivowawibup.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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 17900 bytes
SHA-256: 3a8167eafeda30e6310c1b9bdede1559b22f013c5ba1d0fe182961df9fdfd59d
font_01_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10048 bytes
SHA-256: 4cc4c47fe253f0800ac588a92257986b7aaf3dec8ca60d0811f28937b4811b32
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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