Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e110ee6ba07628…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 00:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fa8cf5cb769d7351f21a0ed0a3fded9 SHA-1: e61aca1522405851060a37303b26ad949c620337 SHA-256: 31e110ee6ba07628ba2b9ede26a8034cb2db1638e677edfed7c246ac53a0f9a5
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. The presence of numerous links pointing to compromised CMS upload directories suggests a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://snypes.nl/img/customer//files/78829253539.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086c891dd0b1---ladovepibuwigaret.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/749e84c0b8a3a302505b667b896b0205/59148672517.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xuzivezezepiwafusepedov.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fc11fc8a23e31e35651b6bdbbb5614bd/fowukelizorowarekasi.pdfIn PDF document text
    • http://m2m2design.com/userfiles/kiweladu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f6507898e4ecbcdbaa2507a80500a7a3/27442492368.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/30995558595.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/wujutodaded.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/xufalir.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41a4d3b824---81756979431.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab56789a5e7---desugukusixufifarokiv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b752cea9e---33617893890.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vupfpgvkbgup4qqhdb77s7l00n/repexotenenijatag.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766dffdf38c---wasokunifuxopovuba.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/729607390.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gijuzomusewotuxozuvulir.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e1fd13f6---pagowofedu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d10374d25b8f1197062cf569d728adfa/lubatopugovivaxezus.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/792125540214b1ce1c0b7bd94a418dab/puzekoz.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a719a102168---68401371332.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f351ebf8b---76635895419.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ekklvq6p1fpsdtkv5fdcn7b9ce/senajedukemafadegu.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/kidevut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+many+shots+of+tequila+to+kill+youPDF 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_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 17776 bytes
SHA-256: 8714ff060646b36674eba3fd1cd105f81829bd26ce918019684c7475eabcb457
font_01_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 10908 bytes
SHA-256: 317a29a7f9c7db1f838693fa65039b506abe379f10cba46e5b5f7d484351f50f
font_02_sfnt_off00013bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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