Malicious PDF — malware analysis report

Static analysis result for SHA-256 f966a56bb4ecc881…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 07:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ad430bfd9dfaa38a4d53509f029d284 SHA-1: 5e8a306e07154c400f8b1fecb4990beea849064d SHA-256: f966a56bb4ecc881c32a583c1fbe2ea0649f85b1d28cf05cffbd6bf6d14053ef
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=mike+tyson+punch+out+online PDF link annotation
    • http://www.gdchgs.com/admin/img/files/fuwiliv.pdfIn PDF document text
    • http://drironcat.com/images/file/34709048414.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/85202656745ed8cb68b6a2c42f88be5c/ralolojizegujogoru.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/sedirixevatirizokineza.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/93643795186.pdfIn PDF document text
    • http://mqskin.com/luutru/files/49149638866.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd641318f---xomuwozoxudotubawinez.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210909_982C0F85CFBE5D8C.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/27078375426.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cf3c325f---28563240484.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fipatefuserowud.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/xukeram.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/1185391243.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c52b87d26---kegakipub.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132588213ea5---82773045025.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/80207571778.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/77080634383.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/14443507228.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613618a5d7a81---52680313221.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zalawo.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/gexakujumitole.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/50518151710.pdfIn PDF document text
    • https://yodobashi-church.com/92521773107.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kubesutibufogiremajabe.pdfIn PDF document text
    • 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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 19128 bytes
SHA-256: 8f16c402bf028fe5403b3f4842914aa161876712b0c3bb254cd226fab9ead2a7
font_01_sfnt_off0001265a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 10508 bytes
SHA-256: 2a2a4d1f8bec0ec32a7eb99c0f50a65e2c422cd41dc4d99b6db6aaf88bd0edce

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