Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e5a1ec5481909…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 18:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a96df56fe3ddae8e17afcae2b487524 SHA-1: 00986e9d95b83615915b475eb8479ba56f17bdb4 SHA-256: 821e5a1ec5481909f66115a92f8a9178294631603ac0a7b5c259ed1634957097
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae24bdfd2---92528179314.pdf In PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/85148357913.pdfIn PDF document text
    • http://intertravel.hu/_user/file/gosupogolojit.pdfIn PDF document text
    • https://edarky.net/data/file/78796762916.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/31696236442.pdfIn PDF document text
    • http://cichanski.com/Upload/file/deletejomabafaz.pdfIn PDF document text
    • http://proxima-online.it/public/file/52165858126.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/90560299306.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/25259344114.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210716/file/1626436181.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d61263663---jixawunofoxabip.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a35173144d2---xadabupoxasorixexesud.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/73469126919.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/20178bb7fc2b042cf4eecf26744487cc/mabuxatu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160778fec9244e---zenazovulilakurekat.pdfIn PDF document text
    • http://camwater.org/media/files/zureleguziwa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2cf12fb9---jijiwilupikowaj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nomirizemiwowipelufat.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/40966041436.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/bq0v8vhgdrcru4i3ham8acuk6f/fenalipajamirineniken.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tkiigo4ec6ohg1qdkjunq51r57/zulisedatisepanagu.pdfIn PDF document text
    • http://kelvista.lt/images/files/fivekukegab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=icse+class+6+english+grammar+book+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 17936 bytes
SHA-256: 26e2a2c2ea94c1a6e8cc3cb2b4607a4e81c4898e8162669c7903b9cb777b61a3
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 11320 bytes
SHA-256: 4a53c5597a12a58b9ef08eb8df0246b56eceb89b0411deff500a4e22ae7ca09c

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