Malicious PDF — malware analysis report

Static analysis result for SHA-256 deac3560a196ab4d…

MALICIOUS

PDF

92.7 KB Created: 2021-08-06 07:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a813bd5c619907c3a16d437a06dafffd SHA-1: 774f834d1d62b11d94401e0df63b4df050163871 SHA-256: deac3560a196ab4d4f6b595fd14ad3d6344153ab22a87c4a4e4e437ca682f48d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://smidgel.ru/uplcv?utm_term=wishful+thinking+in+chinese PDF link annotation
    • http://abwgulfport.com/uploads/files/tuporolujug.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/bijeno.pdfIn PDF document text
    • http://bscartridge.com/pic/dukili.pdfIn PDF document text
    • http://calisnt.com/uploads/files/56251196507.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae50567e2d---besedopetozemunofafamo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088541787731---67329526725.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/sokotibimojusixo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8dfb1966a---jutipavetenojidevis.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3f3fe1925---gumitafosetebogabumaze.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/zekuneki.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/ruvafojimon.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/vuxomuzes.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/79886643098.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/videkat.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/aa9d77fc06bba1fb01b649c9e90afe36/sobogekapazizon.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c0e66f10b---49165945116.pdfIn PDF document text
    • http://erex.hu/upload/file/wadimabeselogafuzokugan.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1413f804c5ed5f3b14bfff80bd3fad5e/89067800475.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b32d7ef03---gexuvifepudumonu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/85728451311.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/47945948891.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 3628 bytes
SHA-256: 4d457f26c665e58144402ed30ff766ce7e69e17aad149e03b0b9c7c49f7097cc
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 10416 bytes
SHA-256: b28ac16617a9e3f7305e130390f7ea6932af3e151c8cf0b6db99a91d4425b151
font_03_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 18004 bytes
SHA-256: b460469f1de9e0c4c98ab75bbcd7bf67b0040864955afe866d14f6d25eed2c8d

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