Malicious PDF — malware analysis report

Static analysis result for SHA-256 807ef87be484827a…

MALICIOUS

PDF

82.4 KB Created: 2021-08-31 09:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8c80cf371d0364ba1be7d1245d5e8c72 SHA-1: adc600fce9993c6d2d69bda5f2265a0e74741b4b SHA-256: 807ef87be484827ac14948662448b3ab4e1a561cb1834eff19426f5c883d99dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection, strongly indicates a phishing or malware distribution campaign. The embedded URLs are likely used to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://medicamarsala.it/userfiles/files/lekav.pdf In PDF document text
    • http://alvitraders.com/files/62968298621.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad983775bae---22096361925.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/10951872167.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eace69d40875e5add73d1ddd9a8a3d45/79660064143.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/29f3d35c748dc78275270bfac93428c0/3279697580.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/karudovonegokibivubepo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6c021eaf5---japob.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pesef.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/10777690372.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608831398af15---vejuxokupilojisow.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/wunefavuki.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/69944070700.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ba433269---monawivexajomamutomepejal.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/18ika5mcaelv9f50kvdmu1ms70/1430357962.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4589b08e---47736207639.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f25e6780e5e---wurakaxakanekinupujomab.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4830f8234f8511cf4fc258c42b855ddb/xuwasawemubedun.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/30a31a6b7a9cf809f432a869672b4fa9/dunodadipenetavisikuloro.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7d8d547d435005b1f0658257126fe90a/35545514942.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/81209270817.pdfIn PDF document text
    • http://dzbnf.com/upload/file///26003018535.pdfIn PDF document text
    • http://mousike.it/img_ins/files/26818228064.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/13695280618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+download+fifa+20+for+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 10384 bytes
SHA-256: 1eb835ab5435b330e158df77cb1697d6670383af9fb606bf97c484360212b6eb
font_01_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 17124 bytes
SHA-256: b35ad4814b230b8efe628d5714da0bf90417ca35fe7816bba13261509966b0cd
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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