Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79a99c746623821…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3bb2e51b1f33bb35aeb50ca657e8ac4d SHA-1: b72040134f08885b0c76646c4e98f07465c0b8d3 SHA-256: d79a99c746623821883739738f8a63dfa6456eddb4ce5724ee4cdd16b56042f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vinniescustoms.com/userfiles/files/64154475798.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614925c06c46a---faxovoxageduf.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/wemegedibevov.pdfIn PDF document text
    • https://5udua.com/contents/files/39623009765.pdfIn PDF document text
    • https://blugarden.eu/file/24241444247.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/votovatuxiguwofosavop.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/limujisatesawafoxowof.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133684ee13dd---40670177146.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/19868622775.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/fuseposi.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/maserex.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/rezabogepalamigezanesof.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/nikasol.pdfIn PDF document text
    • https://semut73.com/contents/files/56725434939.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/zenufowinomerumesowenubiz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/chea35b5mkudkg3lv56gr0kv07/32276103400.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/wotiravemikub.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b60998ba---55443055906.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/59224968501.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/dekewejopelopel.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/29236398583.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/romevemebugudovilur.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278d3a2b3d---wabikewekofaduzoju.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/58930774608.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/padevamewubedevezor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apple+iphone+7+price+in+bdPDF 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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 14804 bytes
SHA-256: 441234ef721028191904b0d648e0798c2f8d2b0d6027032524586b0769a2f924
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 10352 bytes
SHA-256: 334b8ce04010f74382f223a2ffd85ba209f90092b52ecab722bdb3209633d4de
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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