Malicious PDF — malware analysis report

Static analysis result for SHA-256 480810dd4d102f0a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 22:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50fa20859d7f2a9f45d57d88f7f36889 SHA-1: afe09248aae193607b007e1ea69844aa9d39189b SHA-256: 480810dd4d102f0a7a89e5d1390380569c943709338444578a5f87f5f90afecc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, designed to redirect users. The presence of a QR code lure further suggests an attempt to trick users into interacting with malicious links via their mobile devices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kclandscapes.com/ckfinder/triplebuserfiles/file/bokizil.pdf In PDF document text
    • http://ugyvednok.hu/userfiles/file/37515909587.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/nefawevagobiwo.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/27553375810.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/19174686020.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/41471176635.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/46884300854.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sifesawobibenuveta.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/39847223467.pdfIn PDF document text
    • http://someteme.com/archivos/_20210903031906.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/49832438272.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5163d5eff---33437511264.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/nozaxobilojaperepa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136585d48f57---27439423344.pdfIn PDF document text
    • https://fptica.ru/images/file/74355125377.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3203a364e637092c867f3ffd5ff118c3/87881354126.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/75793671290.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368e62efa97---niditez.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d84dd9f22ea969e516dbad13f883e322/27352171103.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/38254640585.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/23658650392.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/31112383170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=turbo+qr+codesPDF 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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 17148 bytes
SHA-256: c838ca334c99fe191489d0dca55770ab1771bcb48a3b5708d99872824a7aff32
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10212 bytes
SHA-256: 0212ef13543e1917fd8a95f05594a830435319025dd20888d323607dc1aba5be

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