Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db004aeb7049ee8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebbb66900edf1d6d43fe900fbb23ac80 SHA-1: 830f2baf47de4dc5ebf84542b0642c67d183a08c SHA-256: 6db004aeb7049ee8ce74be0e8855dc5f901bd9b9a021d98910b0e58d6088a9c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=physics+kinematics+problems+solutions+pdf PDF link annotation
    • http://apogeeconsultancy.com/upload/files/25440967304.pdfIn PDF document text
    • http://myslizdrave.com/soubory/foxumoji.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6f2b63a472c1eea6f3176b666c7e5202/62975441952.pdfIn PDF document text
    • http://allasclub.com/campannas/file/26264669401.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b8b9df63c4e801d204446c6872ece331/79928469303.pdfIn PDF document text
    • http://anupbolivia.com/images/files/merizilufaxebegudesa.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kuwinikudalobixega.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1307e49a---kebuvosizawuj.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094321dbc511---88387247862.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6508c9102---92884147406.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/burubifaxaxavizaxuvibenu.pdfIn PDF document text
    • http://thedreams.cz/files/lobiv.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/66928154018.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kefanofunonogijo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bac44fca814c3dcf04583d1c145b1a65/90007546258.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/10466843928.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/43130262350.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/595b7744b2a3ff3b694ed15f90a234e0/62721712554.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/75014987304.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107300341566063.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nt9321o1pku7sgj28ejtu3mek5/voribukigugifojadip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 18280 bytes
SHA-256: a18a1a5b3fc01d1af0f7bd93dfd68e7a3f8ed753c3486f6095cecf2f38cd7ce2
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 11332 bytes
SHA-256: 1cfe4c19daa7e4534569b9e54c49db156eb11f1275ff8860e6cde8d55d2dde3e

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