Malicious PDF — malware analysis report

Static analysis result for SHA-256 2060482816b23e59…

MALICIOUS

PDF

99.0 KB Created: 2021-07-04 13:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 442756b980975257dabcd3cce79a164f SHA-1: 6297e35393d18434cee10b2edd9ef1979f359c8e SHA-256: 2060482816b23e59cd9f83bafb062e7d0aeaac03424454ace6ddc3ae3eea12a0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=cool+words+to+describe+someone PDF link annotation
    • https://anthonygillant.com/userfiles/file/12904090285.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vupirijiroreson.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4019391532---nuwana.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210602_E2EC65F47FA3F84D.pdfIn PDF document text
    • https://efnnma.org/files/file/56565340024.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/letuzofebara.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/24711700143.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160895c910593e---dufodidaxapajiseve.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/rujusotugoneluparupo.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/sexiputu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef4fbfbd9---81397587503.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70fbb7e02---zanulefof.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38b7ee296---38673617740.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/af651daaf86f28fdf0623b01b59c80f7/32601823915.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sazerepodamupukenes.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160715784030e1---29309999423.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61ce577cf---35838580907.pdfIn PDF document text
    • http://vucert.vn/uploads/files/rajabeve.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbde239fef0---merabev.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029c664434---xovumajetebobumuxogumixup.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/99258841229.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/48612183790.pdfIn PDF document text
    • 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_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10628 bytes
SHA-256: 33e00824f7bb31617ae9368f3f8a8274be5252cfd0518a7c88947efa68bb5c16
font_01_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 17616 bytes
SHA-256: 9f88ea59a40c5e8d5a4ec6b3915c37fd7cf13b0b23cbfe134015395395e994a7
font_02_sfnt_off0001654e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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