Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d459730cdea402…

MALICIOUS

PDF

67.1 KB Created: 2021-09-20 13:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 61a6003a1617a075f8cabe919617045f SHA-1: 5da48ecf48c53c0eadff8f865b441f2beb940a74 SHA-256: 59d459730cdea402dd9fc60ad407cbad2195eed7416f2a53305245562365335b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5755

Heuristics 5

  • 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
  • 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://laplacedesstores.com/upload/file/pasetijupo.pdf In PDF document text
    • http://kaithompson.com/userfiles/file/33202154927.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/88705971199.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/60109637106.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/69718965377.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/vemezafu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146aafeadd0e---xivegatikawilikobevujez.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/vuzovopilipijo.pdfIn PDF document text
    • http://tabletopad.com/images/file/18184254439.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d83e05459796faa0f2bbc50eb0be010d/41469955678.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/nimogulipusamudere.pdfIn PDF document text
    • https://vitanov.rs/files/1718941142.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/5914874642.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/58252466557.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/78124539508.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zatolowoloxur.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/27126034586.pdfIn PDF document text
    • http://sns.hu/_user/file/jemos.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gepure.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/51327329221.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/65450118361.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143b68bbfdfe---45603475119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+unparalleled+adventure+of+one+hans+pfaall+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10632 bytes
SHA-256: c5a30d7c9c0d0c6e9b1c16ce350844772b8c6d942591ba6da236af4ba3624486

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