Malicious PDF — malware analysis report

Static analysis result for SHA-256 db534017fccb084e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 03:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cf51777dd337d9404dc16e0e907d2ab SHA-1: 5dbfd3e5c323510c09ba1e344ce01148b632fecd SHA-256: db534017fccb084e39e469bc02fdc9a40dd12f1500562c8f1365bed1314db5cb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=stickman+simulator+final+battle+mod+apk PDF link annotation
    • https://inprovitcaribe.com/ckfinder/userfiles/files/34664782763.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/19a9db2690447125a5fb89179e4919c9/142725085.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/funepimuzus.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/80598120570.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/34151071952.pdfIn PDF document text
    • https://rosycaffe.com/file/48509674085.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3e39ac3e27eaf4732caa5d6898572f96/42211850492.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c54058a9---dizone.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133244130927---74976478498.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/xarovefamijesazajuwin.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/61260925493.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/57812917391.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/telopadideda.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/76114054036.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7433daaa975e9f7b6594b160292c8f53/3539955305.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/kuzawul.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/bekepev.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfdaba20c---66567782842.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zipobotosudixu.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vezikuzo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/81d1835260922ea5909475da5bf84a1c/34616277185.pdfIn PDF document text
    • https://msvadba.ru/files/file/guxiravemugijazoju.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/11856987488.pdfIn PDF document text
    • 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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 19624 bytes
SHA-256: f635e4ce21fce26262024248aa7dc1d226d340020921c1f5ffd0aa74183230b9
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 11188 bytes
SHA-256: 818ded9db1821afdfbb041171fd3178c4660ea582a116833b949ce45dd1ae6fa

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