Malicious PDF — malware analysis report

Static analysis result for SHA-256 5451b5d80e72c506…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 16:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b912e9022f075dfcac56a6b63ffc0a1b SHA-1: 39cb50395afdd07a37ef3554d19b37ebe5743f23 SHA-256: 5451b5d80e72c5063a89f33237a1a6aa6f8fc169096bbc21d4758546a18245ac
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics further support this, indicating a pattern of using link farms on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://tcsklife.com/filespath/files/20210815012917.pdf In PDF document text
    • http://lws-realestate.com/userfiles/files/wutirumemakubenibatuti.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nuletu.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ehib1il3n0mnh9b1devlgmsep3/tuderoxulenogalapem.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/60974020137.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/kufuralizakovejuse.pdfIn PDF document text
    • http://thaide.org/userfiles/file/nipebepaxaxu.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/setukametizorupebomutul.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/67678296606.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/pidinipenezidubekuki.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/60232384353.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/61824209922.pdfIn PDF document text
    • https://e-midas.ro/files/file/mediteluj.pdfIn PDF document text
    • http://bamor.org/userfiles/file/69531078327.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29edc3e9247820e51fddd02242d5a43a/68203159829.pdfIn PDF document text
    • https://jurad.eu/files/file/busone.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/38599249031.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b43e465462595bf8d15b24dafacb2d46/4611476069.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/73757358663.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d9095788---68681282794.pdfIn PDF document text
    • http://baby-daycare.com/uploads//files/202108041012217466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fractions+adding+pdfPDF 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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10592 bytes
SHA-256: 182fbc08962837da9c35566c40e530dfe05fb48b58c7e80bcd031c32116595e2
font_02_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 17764 bytes
SHA-256: a4467714eef4e9c6b65ab6c103979793e7cb931c008a5a94ca6e2e13261406e3

Open this report in the interactive analyzer, or submit your own file for analysis.