Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fa6a1c61ba58dd…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 10:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a77cea18242b8bce401f19b7ff043ca8 SHA-1: bbb2063d6707ac2cae58b21b50f9297b84d65a8b SHA-256: c7fa6a1c61ba58dd10a5a8920974f7efb6b553f19b25239112e90c68ecf4b048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/wapufukagewebuvovo.pdf In PDF document text
    • http://emblem4home.com/UserFiles/Member/File/36675755492.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131838ae22a7---37403270186.pdfIn PDF document text
    • http://ud2-140.com/files/gizikilunizakimuvozu.pdfIn PDF document text
    • http://ippon.lv/uploads/File/luruzap.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/sidezibezoxubelo.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/87261440929.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/rowilej.pdfIn PDF document text
    • http://zeci.nl/im/image/69951008660.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/winogojofezadaxonufozed.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/89649156924.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/2392037582.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kowazipomusulegotonovir.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/pifamu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0cd4d99a---xelosotuwogogukonuv.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/kikuxinobazuwujeti.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/56532152475.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99ba1809f---xujiv.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c7dccaf3---voxejap.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/jajetavaxerujedem.pdfIn PDF document text
    • http://domplus.su/userfiles/files/17917980694.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kemosukalumajewaduzan.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b5250d0---namenodugixizubesozul.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/fepipegoxepif.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210909075121476755nfdxf.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/xixufadut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=short+words+starting+with+yPDF 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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 10624 bytes
SHA-256: 411f5e0babadfccd5d5e24128dc74002034464f296bb96f515c9eceff417cc89
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 18084 bytes
SHA-256: 97673cf39e79d9c8d93b297a59df06ded33badd2f710ecb8aa193d98372f54f4

Open this report in the interactive analyzer, or submit your own file for analysis.