Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13c7ad250c26fc3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 18:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f80f73282d51c402abba80550766bcc8 SHA-1: 6167c67a2869490582c7e61afcc9d123449fc9a4 SHA-256: d13c7ad250c26fc35ade68083c583cf21f6b4abb6c4e8e7cb82e810b72e7fd67
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://abwpetersburg.com/uploads/files/rebavamanafixuwas.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/duwusowel.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/78693132130.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/255d81dab843894ee73fd012fc209b82/towenepeli.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/17399201593.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252798542---nuxepasinovofas.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/banolesakunatowamelola.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/budaxunevewujeduxevizi.pdfIn PDF document text
    • http://rotang.net/userfiles/file/kekevijefasuveji.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210801160820.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/gojawoxog.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729211d63b1---87608222536.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/dunedobijuwevareritugux.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021826558258304.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/doxodobukikubexufizi.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-2/20210702031748357029.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108291813313600.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/39601806081.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b160acba56ecb00eb8b17e284f2a7288/tovepunajok.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c54fa5606490ff5b1cd86af8581b86be/94258242818.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a574bd1d---xumoladitavuposu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a849b91e82a---xonikeluf.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6648afa8---lavukuwexoxewunekepuromu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=calculus+1+pdf+downloadPDF 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_off0000cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 17776 bytes
SHA-256: 32d600a7567e54b352ed6e227c6355b97574d20b88d40ba6a4b4c8421208c926
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10460 bytes
SHA-256: 001daa341b333e90a35bb8ba6a008fa663f20dba11744d587b2b072d0edd771e

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