Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1666e4da3a568c…

MALICIOUS

PDF

89.8 KB Created: 2021-08-12 14:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f2ade4839ed29f860aa94297d2313eae SHA-1: 4eef3e34cd7e6ee5ad0defe1f119d33a367f1930 SHA-256: af1666e4da3a568c32af34ed556c920508b612f1a9957e065350d9e87e148867
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a lure to download a password-protected archive. The document body was unreadable, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607213dd462ca---19131394878.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0c70f2dc2ed0409eaa80b2d45823134b/bopojuxomomuk.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/21511916963.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d3ed984---taniluwidirikisi.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/5202719084.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/riniwosugokenuba.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jozabezuwuzufoberiwujetok.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xalalakojidonifow.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/nupupu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/76695555669.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/mupedesepoxowukadeki.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5438973ea12e37e6e1b020ab9a2c2b71/ritikimuxenigarulesoru.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/24016915609.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/48643757754.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87114066907.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/51394881324.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/68dd25459f6401ed32f4c494b2576322/zidipofelekijetajilojawe.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/savolodufeboxevik.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/31638a61062a576f92f2d052ef056760/33300325163.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94ac9ab83b---rijetisipape.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/pibekadabu.pdfIn PDF document text
    • http://vtaky.sk/media/file/76756186260.pdfIn PDF document text
    • https://kawanmto.org/contents//files/rakulelozozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=como+compartir+archivos+en+red+wifi+windows+10PDF 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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 18052 bytes
SHA-256: 450bc0bb1209e793fd8d61c97df4ae6031fd353f4151e7f191cecfb1ba408c9f
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 11196 bytes
SHA-256: 0e927e25a09b6e64931cfbffc50c4ff0fb09f3c403bdcef2e580a68b726fecdc

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