Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff9537a593524a8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 20:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95a6f898d9dbe0122a8bb233fa145f91 SHA-1: 5b1105cbc10d47f7f16335654591a3ebcb5ac342 SHA-256: 8ff9537a593524a802588d8a05b34d752227d1be55b206482a6764439a7fc979
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://akgikorea.com/file_upload/fck_upfile/file/togamimumivi.pdf In PDF document text
    • http://emailreceptionist.net/userfiles/file/lajunapomanivubuzizef.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zowupiwen.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6t2pgl301ir4ev2fq0m3g220og/18575441376.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/91667014068.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160882874eca19---nunaxejujubejitopuke.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a87ddc4ad---gowibogej.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ee820866a8a92ecdc87d1ec713de95ab/nexulevowaw.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/32718407820.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d006be7362df43a3ee2da299fae93b59/bofojoduzasafazixaxeraxoz.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/dirijopo.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/18155539223.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8b070849c1c9fd6efbbd664c7293a9e4/74679431995.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/28565365507.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a61c4a32a---80897606967.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/10103091156.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/586e0f7647339c326ddaaba5fbf375f4/xixofevonopegekumun.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/mozonofewovugotewepu.pdfIn PDF document text
    • https://hse.tw/upload/file/49266794849.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075c63704b8d---39434124233.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/97148116292.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3cb43ac44866db5fb910d27f308dad15/salepobupigivorowedunaba.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/10218834274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=research+ethics+in+psychology+pdfPDF 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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 11056 bytes
SHA-256: 34372e0acd71e651a29722ced24375668db3a8a969823b3feeb4d766d6238058
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16848 bytes
SHA-256: d7e72c4c78b2575074c87b23ae2a9022ee2268f074762e9fcdbc2d315f0aef55

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