Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb15cfb6c34f76c0…

MALICIOUS

PDF

190.5 KB Created: 2021-07-13 18:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 172f33f80d3cc59a56832a7c9bd07014 SHA-1: 3f27d12ff083274f4aaa5fdfbe5fe5562e10eb4d SHA-256: fb15cfb6c34f76c0c9f2c295e629a6dc25a371ea7cd89e5758f98bb44f169d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs 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 true intent but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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://crewmak.ru/uplcv?utm_term=i+thessalonians+3 PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dad11e4b---luvezuk.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/63311156187.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1102155e6---55000073600.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1acf236c1---vifuteduxitazupan.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/62141053403.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3f6438a0---83758769917.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/61791906074.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076700806363---26046984490.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sizanozuvip.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/bugixigilusiv.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bbbcc8cb426869cd8df34520ef2f5a8a/88541198144.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/matogorimi.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/dakixobun.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c683dcc19126bc162c215eccd5d06a8/durewosenavademezofufadu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/rivigubotab.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/76127706774.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bdf38dd3---magetavikugepuk.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/43246436252.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/ruwimafupofelixeberaxaxi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e750f75f782---bumejaxekojogij.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s05pguuo7tg6vrs39jr1prrq94/12435586554.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00025fff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25FFF 17684 bytes
SHA-256: 112ace2baab9f2e6e161b54de7b4b73bf065a3c6212d6050804768be31feb9d0
font_01_sfnt_off00027b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002932c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2932C 10228 bytes
SHA-256: e0eb7ed1cb2eaf2b5cbb2b6df9008d5618e23137f0cc868bc356a249fb77434e
font_03_sfnt_off0002aa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA17 29816 bytes
SHA-256: 56ef8c2c818278a6433d9574baa4002b3ea36c329aecb2a25b3790e94bcf51eb

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