Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ec8aef6523495…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b28ed361f065e5bfe5cd5a1dd9bef20 SHA-1: c281a6a1b813a0fa95ab3e62dbc5b347d3636b72 SHA-256: a43ec8aef6523495173c2d5367bcd6f7dd9ed5f4c2593475592b6a56832e9565
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the download of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=harley+davidson+parts+manual+pdf+free PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9i6dn1c39f8vsqv6ned35uv7sd/pimaxarofagijep.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kajebenudomij.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a3425c14bd518b9e1900316f47c12c0d/66002967357.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/witirarenavidejufexunaju.pdfIn PDF document text
    • http://e-hematologica.com/users/file/puwisuzesa.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/simepuguxu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/54997817583.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba1a77a86---pifasuxusivaxuvijawipo.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/39682190200.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d547c5bba2f---torafowojunidojujapenaj.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/31un5mt71eqak2esmga0i2ceuh/61934134676.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/29460031070.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/21781330288.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zezefegadudozole.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/72003342294.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0499a2333---judisesagobadobotajik.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1v8ockm6gg0idje7lsuardn62c/libipowizawakokin.pdfIn PDF document text
    • http://fedime.org/imagenes/witowijiditam.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861aedcd93---bujatebejikorafizeziwaxit.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/3631506553.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/76286447548.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f3fc0cff46fc81b9365613f9861a2be0/47578705989.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/59410037537.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_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 17408 bytes
SHA-256: 87bd8466dbea5e14486e2829fcc4f0ca7df38d1970236cb8d4ff5ae91b5e230d
font_01_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 10928 bytes
SHA-256: 8a99826289ca1d453a9974325c0685254bcd2fe7155403fbfcfc64aa31b1192f
font_02_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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