Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4af92e78453e6b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 14:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d850fd3fe1294eff0edf496fba1477f4 SHA-1: 9a297c012c701a8c2a39e8342edf16c05e9bdd97 SHA-256: 1f4af92e78453e6be7c6a8493e9000413ad36663e3955c8a7c38a197cba8330c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear user-facing content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=how+to+find+android+phone+using+iphone PDF link annotation
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/74917415618.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50441210844.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/biwoxuxokeruguladoguxu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130e38ee3c7a---maguna.pdfIn PDF document text
    • http://guchen.ru/d/files/xibekaxanonafogibuma.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916091639.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/32285586059.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/datakekejafaginepogi.pdfIn PDF document text
    • http://ciskmv.com/css/file/71010288346.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/21595545995.pdfIn PDF document text
    • https://masukpt2.com/contents/files/70108443226.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614256b44d62c---45731224990.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jepolepemetupuvulunilepuv.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161456173d4ae5---janigumabojarulurojaberaz.pdfIn PDF document text
    • https://plasy.com/uploads/file/dozel.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/btemf6g0e40llldpco1bqsrg23/niferubesonevud.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8601479746.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/90168181214.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sereredozow.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/65501800079.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/lijep.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/78859167279.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/37666880807.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137e8cbc071a---87369792171.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/20319933859.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/74902531272.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/17959846240.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 18980 bytes
SHA-256: ec1bbc36975cca2c6062868548446675f6787d33caec4a16c1d5703c7aa91f79
font_01_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 10908 bytes
SHA-256: 780fe66ba83421acd017da4f596fc3fa24170710b8d1b07c1fd815c3c42b182c

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