Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3ca4694063cf47…

MALICIOUS

PDF

91.5 KB Created: 2021-07-28 01:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f76abc3e4c4aec9a03c5797541aebaab SHA-1: 48ef6a745746f0918ab467b08cb57517a9bb6201 SHA-256: 9d3ca4694063cf475e7a5a112edd1f331a0e8065220b1ae1734263f20f71e537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe13bc26a6---fubuluzazi.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be456cb0947---80493513470.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/786a9caf392451937efd0e08d9e23d58/vozorawipesonapuzunuviles.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/maxedat.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67217108749.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/138c597527e9264179b6ebc585cd9a9f/visirewimod.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/rofurifefazokirugati.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/7790588176.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/zeguwagesimefiguxuni.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/legodivujupuwa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/da7879db7e1ca900b41f803b5f76681a/31764456567.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/66276974119.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/musigudi.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/72668858164.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/4609162977.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/98477869318.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///44404296726.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ls0tho75gulhrg3dumkrb9lq3h/72118601985.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/24584005930.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd477eb84e---fobamafivevejozazig.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210611133319_6ltmx8.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/zuxokidiparej.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b4b2f21d38a2b5db9c3b8ec644700cba/99373950642.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/lipopewakofogujopol.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2f022b1deeb44b6bc0cff32fc1e824e2/zilevojijawogajivej.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cff36713bb1c748dde7246ef0c12d546/6880514737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=star+wars+galaxy+of+heroes+online+spielenPDF 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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 23848 bytes
SHA-256: 477df3369c555c703112df5994b0a2896b14011736d9a841d2c60b9985f3b789
font_01_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 11012 bytes
SHA-256: 6898505881c76cdef07034bcda7f9b2c838122a89faeef9d704a5461b9543190
font_02_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1