Malicious PDF — malware analysis report

Static analysis result for SHA-256 327334dd41fb9d54…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 02:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d68e015ba47a3098e20c6dcf132c7c8 SHA-1: 4264efad17f5a6c51d3cc3899a9afd9669203912 SHA-256: 327334dd41fb9d5432b7e4017d4f110ecb327ced4c1b760e53e8d8e38f21fcf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly suggest it's used to lure victims into clicking malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=vertebrates+and+invertebrates+worksheets+activities PDF link annotation
    • http://harekatmemuru.com/images/Media/files/72989733138.pdfIn PDF document text
    • https://strechybenesov.cz/content/52893765404.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/zananovazozemu.pdfIn PDF document text
    • http://henca.com/files/details/file/gomanisujunularakifum.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/nanijigifekutevozomuvawul.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cb88ba3c61b4eb0e2ebd817ea778fe94/69330953431.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/losesobusomimol.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/gotosulela.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/kujisivuziwojir.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6d8aa5184d1cf24d6d391bda0bdf84a4/nuleke.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160987a79b3aef---novemev.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a660587d1f9---nizabukeporodiv.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/wikiguf.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/53670858640.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/50897261890.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bagosawutoxaji.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/4050040652.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/22582825989.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/63371160612.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/feredabetubolena.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/livokevolik.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/sawikefumerutezi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1na897kga0eotvncukn4ucsts5/68338503373.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/43574213915.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_off0000bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF91 10776 bytes
SHA-256: 1f3736246bd40fcd702c60611acaf00c655e57ca83515a3c6ea5069a1484fd43
font_01_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 17384 bytes
SHA-256: 64c531e2e210fd5d2e9059da41583e14eb5615b0e5acf7ffcada03262f6df700