Malicious PDF — malware analysis report

Static analysis result for SHA-256 af89b08eba767424…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 18:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 34878e45b1c5f621e028d54176da3b75 SHA-1: 0963998e8e51ae2c0e718e299edb8eb6a1454f1d SHA-256: af89b08eba767424aa3f0e4a4ffbc92b0f1cad6c39e32b8048309adae703449c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm hosted on multiple domains, including compromised WordPress sites, which likely serves as a lure for users to download a secondary payload. The presence of a 'download button' heuristic further supports this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://fs-select.com/images/blog/file/45337378822.pdf In PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/93952700292.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/puxuxipikujawolupeke.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/8241172035.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134fdfccd647---nafefafevojijat.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef14230d55---42653678347.pdfIn PDF document text
    • https://termofriz.rs/files/xonawizetekaxiraxa.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/87636414119.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8a8d166262852c3f1c3d7d412e473359/55739363815.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/xolejenabobeporupadebi.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/17858540545.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/bomefizolajedadagepiviv.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/29329933319.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xepinukasabamukim.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/95434599771.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac945d9bf68bdb435a92e523fe1140f6/71000182556.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/651114761.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/gazufodesuxilagaderoni.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/sitepabi.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/savawazobeza.pdfIn PDF document text
    • http://www.77ice.com/upload/files/82380045710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gold+tom+run+mod+apkPDF 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_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 17900 bytes
SHA-256: 9c00136867a92d7782b799ed72c4ac4ffa1ca5bfedcbc2c1c06132139a058ef0
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 10392 bytes
SHA-256: 2af6edc707cca45521b7b88db597dddd181354aaa16828406481cb09ff9dcdba

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