Malicious PDF — malware analysis report

Static analysis result for SHA-256 22253d04d92ea3a2…

MALICIOUS

PDF

88.2 KB Created: 2021-07-13 06:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d39039299818d1cdeca4ce5fea828c0 SHA-1: 56c33927eef9cd5091ff3f0a2d841a998b82dca7 SHA-256: 22253d04d92ea3a2dc30dc1080b5aea669ba49826a78680c8c984420d5651cb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=how+to+draw+tattoo+in+hand PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf5abdd2fe---32057769799.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c4364322---9148107634.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/vaxatizelirifajoximoregid.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/515fb51aca8ef077311108217ca62de3/50510147897.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512031233892875.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009808fb12---24910726225.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d75df05f4---63061021589.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/94eea1cfb5f81356821e5685d036235c/kokidod.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7j4rnbigpdsvohjp15jur230i3/46241528492.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1dfekvhd5vi9vl5vkee8dak9ro/sawadonosugadiwonepa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/25515893857.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061912552670554.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/sakoxeg.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/90793955462.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abdfe4e586f---17842580496.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/71278976899.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51365c33---34062931247.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b950e815e0---93542447264.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/13874004198.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/68814119481.pdfIn PDF document text
    • https://deepex.hu/hirek/files/44906587394.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/tafuveg.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dutebelurosawap.pdfIn PDF document text
    • http://yuha.be/_files/file/dukutemavaz.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_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 10076 bytes
SHA-256: d251e8ce64f138265a3e39985e71c90c19eccd3eb19d36abccd17f0108c52ce5
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 17044 bytes
SHA-256: 52542dbf6787062d7ee59a7fa17903c1ead5c3a2f994aa88e90e90efae34332a

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