Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cda962f7ab1684…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 17:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e45f4f7800dfb96be5d3f8e879e69c0 SHA-1: 7af1557d22d835bdad612fb15b2c42265bfde9fe SHA-256: b0cda962f7ab1684d9a8be4b2f9f21aae75652f937b2db8fffeec7011d25191b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content. The presence of invoice-related language further supports a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/dc124c7f639324ee82f8991af2844682/47500331387.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4751ae85b5a6ba8d3e819a84ca3a52d6/dobalivudigadobubejenimul.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/20014867428.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff30e6c968f---80688366966.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d572b1cd770fbeb7c1a137aebca8e27a/sagefis.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55ed07d475---28922075570.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/tarax.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/belabizogepodogokujega.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/41794880236.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/22435156974.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/tewevo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f67af8c1---dumov.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/8719304100.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a287184540---rujidag.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0817e6b0dccca9e0f76e8898b1ba8d03/3496827.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/fixiboxe.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3e36753e---dezijamiba.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/liluwatodenaseboreparik.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/32dec2ccaf76c33f33493808ad705f55/75084132703.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a7a268a9---wibowijutak.pdfIn PDF document text
    • http://iphysiology.ru/upload/firezadulaf.pdfIn PDF document text
    • https://riwg.in/userfiles/file/21235598120.pdfIn PDF document text
    • http://lucann.com/Upload/file/buboponi.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/15156078964.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i4oce570824i1a6fq7l67bpp66/joxuvoxipifilamexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=medical+billing+interview+questionPDF 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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 19308 bytes
SHA-256: 96ec7f3a3902a226d77a8f912787102dfa71cfee4c01fd3bed2bffdafd8fb675
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 11076 bytes
SHA-256: 77be442a78d8aa73df199182e96f6c4041c74ca6996b0b6671e738a18efee0c6
font_02_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1