Malicious PDF — malware analysis report

Static analysis result for SHA-256 588b696062315517…

MALICIOUS

PDF

101.3 KB Created: 2021-08-12 09:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea0b25620729bbbc31d8a45d0895b935 SHA-1: 376d2d1242d9351a3a28278ce00e948ec94fc6f2 SHA-256: 588b6960623155177422f301250fd0aed59a51b636ac06ae05aa8e0f98520c18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a881f28eeb1---gimit.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5264a04b9---42703262968.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/jenolomaluwofilutapaxud.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/xirexavuton.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48897630804.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4c91efe1---tiges.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gimumixipe.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rutitu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f251c47ad22---44837622470.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1c75ec2fd58f5270aceeb24d7c31e041/29987697769.pdfIn PDF document text
    • http://computerdoki.hu/user/file/1410858252.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/69610973328.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/38045423435.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9ecf8431143aaf06f89102d3d1028827/sirasifirisuze.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082036fd4d24---sufezibokodezibazesot.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a7b9db8d0c2bc25ee831955cf6dd397d/45606407424.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607822ef659b5---9579010981.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/53032744050.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8c4f0add8e0f286dda73a68a1cc14270/62707995586.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a78c71ea87564f73b351bf2539bc08cd/39831677184.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7a8343e6b---pakafogiwuvovebedunu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/guponolosumuwafazifi.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/nufefometuzepivazuzef.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/runonabad.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/sizoramonifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=permittivit%C3%A9+di%C3%A9lectrique+du+vide+definitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 17480 bytes
SHA-256: e09f41216b83090b7b1fd8ec5a15fe50618079aaa210c64c7b2ced1dc2072a50
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 3220 bytes
SHA-256: f7564a3662dc21005497f5f123174d3955ffb4888ffa801cd032df34a3eb3d5c
font_03_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 25016 bytes
SHA-256: 1375c0776d6bf990e4a9195531d42948da4edccc17ffd23281fbf892be6c3c6e
font_04_sfnt_off00016abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABE 10776 bytes
SHA-256: ed82b21b737aaca6a1ab8bea82aab5f8dff94b077fa7aa2c8385c24a671ef835

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