Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa5c50f94eb3eb5…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dad56d7a565f9acebb52518cd254bad1 SHA-1: 75e2a49a04c9507d0149cb7cbaeaa947883016e6 SHA-256: 9fa5c50f94eb3eb5dba1bd9eacc0a3535e49907d869ba12c4196620cdf097b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other potentially malicious domains. The presence of these links suggests an intent to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=liate+rule+full+form PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/11970446963.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/16721766375.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rijakotodu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614689ca813bd---92014098506.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/73110353076.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4209b9f7---mewununemezaliju.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/12774300489.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/95650344561.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/gowilobobomuvovatijivut.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389e83e119c---85112501100.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tijakufadekademo.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/dawemepaviro.pdfIn PDF document text
    • http://skncn.com/u/files/tujapa.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vavokugip.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210910_090526.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/66843188640.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/21770422879.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/67047563943.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/tumotafemuxojajifexalazup.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kf5ooqc46v41fo2km50vr3flne/konexigumoduvaleta.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98838127993.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/widobexejanakodufovamelo.pdfIn PDF document text
    • https://yodobashi-church.com/16605855535.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xawogavar.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/14457697903.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b544b6b14---gerutikagaw.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_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10160 bytes
SHA-256: 9acffca08950123ac5d48ec9d9a6323ba85679a0cd5772a05f2eafba01915d7f
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 17872 bytes
SHA-256: cfb9d0959ff78c02aec68c1cc87123db8c91688de41d828df30108d66797d2f0
font_02_sfnt_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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