Malicious PDF — malware analysis report

Static analysis result for SHA-256 f281a6ccea89bb7c…

MALICIOUS

PDF

99.4 KB Created: 2021-07-17 02:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 716d492abe1abd5d4c6f1d3879d798c5 SHA-1: 3b58c16bd6338b38a22e1d5ae52c5371ffcd51dc SHA-256: f281a6ccea89bb7c482cc0cebc33b06f4cfc3c3221418006def60ea4fdecd9b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f767d8f5445f4050b4089aeee9fae0a7/54238345813.pdf In PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/2773916828.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ecbe0a65272ceb98c02999be29cd743a/42527622156.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/fuguguxoganogudetorotam.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/pozenupofalobe.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd099866fd---27374505565.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/99672633867.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160868ad3b2a6e---tanoborawulurisebu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bc1abb5907ee4ef91693ac57a6c6c098/85733286040.pdfIn PDF document text
    • https://csn-alliance.com/data/files/ximefoxazegaxosa.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/85090929045.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/zazip.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed14c5cdf---pujifaz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe29741441---sepof.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4cbc73aa---zibul.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tsi6kl2knfktpuerk0u793geql/50999736483.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/99cec4d1bd485b354bfc53f3ce734d29/mabigezegibulegejini.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/tewedogepetawi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vixutumagukujesirugugimu.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/lakodupasejebod.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c398e721d16---rofage.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/riwelipamabimegetugi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4i0mkrb8bc7qmhq5271s985alp/30686282466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=notes+of+class+12+biology+chapter+1PDF 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_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 11060 bytes
SHA-256: 71154f3bb0c6ec970f8c4ed76f93c56f5894a540c27974bf2beae7432c4b1ae3
font_02_sfnt_off00015159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15159 17040 bytes
SHA-256: b6b2a347fe49dd3a52f089217ec14b026e305b4f99de580addc18516ba983fba

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