Malicious PDF — malware analysis report

Static analysis result for SHA-256 9077b33d882f00d9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 08:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3abbf66fbaf4b4cb8b7274841da3ae73 SHA-1: cb260523e15d4960bf77e9f9b9f9f89cdbab61c2 SHA-256: 9077b33d882f00d9a8b895d4a22214e7d6dc5cbf9e95c37aaee902e19919140f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://igruppe.no/ckfinder/userfiles/files/kejuvopowizajupe.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/29276495732.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/66607784764.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/33530711264.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/72205010522.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/26869624538.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/titunox.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f883abce54377ec19e844b358197ba9/43258978994.pdfIn PDF document text
    • http://risme.vn/files/julovalo.pdfIn PDF document text
    • http://18554080.com/userfiles/file/92815441521.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/98518182916.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b65137be---4171158487.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/bunap.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/27100823831.pdfIn PDF document text
    • http://premo.at/userfiles/file/wevoxutagurelujipufa.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/28385774811.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df8910f41---4852497710.pdfIn PDF document text
    • http://bresky.cz/res/file/kikuwusuvegebaxuzit.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tiligebenazaxepufifij.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f847268c---53613788558.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6e36a344---72152894006.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-13/20210913075216668853.pdfIn PDF document text
    • http://rococosofa.com/files/files/fijun.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dsllqg92gncgn42bhkos74n0rk/23402100811.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/34601178297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+are+you+afraid+of+the+darkPDF 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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10556 bytes
SHA-256: 409de0dd9c9a05e19bb9f0caa2a844a3ebc821ff1a4200ef3cda47c8e98d77f7
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 18660 bytes
SHA-256: 19876dca637086c3f06cc0bb3bde4f19e2df49fb68a6accac796144d5de4e1f3

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