Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa22f87a8fd5f36c…

MALICIOUS

PDF

74.8 KB Created: 2021-07-09 12:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11fa628ca17eb83737574cf1674820e3 SHA-1: 4d8b98ef7365c01394bb0daae87a6eb6a545b61a SHA-256: fa22f87a8fd5f36cd06ad05ee71ce2f9a9704bb4fcffba1e076c1f809eec7ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, indicating a likely phishing or spam distribution campaign. The document body is heavily obfuscated and unreadable, providing no further context.

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://krisoc.ru/uplcv?utm_term=continuous+random+variable+real+life+examples PDF link annotation
    • http://rszm88.com/upfolder/e/files/20210603185856.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760cf707dbb---mofularivosi.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/xobufugemojezosigusula.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/43164065315.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/573d0407efdcdfcb9f4eb8dcac0d3d2e/darapexemubak.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/bodisedebiguve.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dakugetubi.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nafowusovixoz.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kotq488co016huulj8clitp42c/30431678070.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ac912af0---dokojal.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160839568788c4---xenixavenikipamu.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/37586032338.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061607504873499.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ebc7bb4d---76587028717.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160defd294a347---nisejaz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bvlcmbgoualef4mqjnrrnl7hd5/86772520811.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/36592115416.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eebe7cd46---fitenodutasulalutewe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7rjf882krnhprv8rngosm9kfe4/53796023803.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/747ec7a497c11c7ad6abe3da9e040d32/44767442758.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/42c0efa9578f9def786afffc726f72b5/98393971039.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/140acb99e061e89b9b34db0f397c6c3b/22750348970.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///39565530969.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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 11100 bytes
SHA-256: 91650903732f234472b1ade0a8ffdaf6b9a9f28d6840345eac0e28b5325ae70c
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16400 bytes
SHA-256: a1973721999b09e92e19f59a05fc370ce11a6f6559296b16c30ff38946519944

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