Malicious PDF — malware analysis report

Static analysis result for SHA-256 98250143c2c481b3…

MALICIOUS

PDF

83.1 KB Created: 2021-06-30 16:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa384d90706e69b1b7ebbd963a2da0f0 SHA-1: c712da327cb8906022e404a26bdc93be623e3c93 SHA-256: 98250143c2c481b3c1b787e78f3365ee5874da40c21046f25490b4e892eb650c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a spearphishing attachment attack vector.

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 http://onnetsolution.in/userfiles/file/50737535251.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/14813778518.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160957306ecc03---61489774745.pdfIn PDF document text
    • http://drironcat.com/images/file/76330179382.pdfIn PDF document text
    • https://alutat.com/data/file/kakiza.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64d843dae---28827093761.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/jezut.pdfIn PDF document text
    • http://ipublicity.cz/data/file/67019794375.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2klrtjleqctj4996ujutv3g8gf/56495195597.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084134419c31---84327175190.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b225a10bf9---51857317885.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/6408472987.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/wopanipojokaj.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/78570134210.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02e6d40a9775f2104820a02ddf49d7e8/kizupisepugufofexemuva.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5gjdmmjcrgljscjjmduc6v8e96/89055441372.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/04ff0a68e7db0c381b2fd9dd1dc7a1fc/7503290409.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lsmm5r45r58s32j3td54bvotli/zovukareg.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/8a6o3i7tp77ge1ua6dipe5643g/10241676251.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b41733b6---59998563149.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8oo8avic67elilkc4s460dpd11/wavegozarola.pdfIn PDF document text
    • http://maihome.hu/admin1/file/41197287443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=letter+of+indemnityPDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10208 bytes
SHA-256: 7c027f0771a0a9d9839571b2cede5ea3a58f9d1f9a0b92d00059bad4f303e63f
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 17564 bytes
SHA-256: b75c1eb4183f83ac6c7e5924b3dbfd989626b1f730de44a275882bfaf8686be8

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