Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e62c8224da6993…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 02:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4980d4d0693d2562f2c709bca9238610 SHA-1: 284afd6b7bd072611c9b8da8197ff78bff7e7951 SHA-256: a5e62c8224da69934b4d58d212a3151afac2f168b077304a6788fee46aa2b3fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=tyrant%27s+tomb+free+pdf PDF link annotation
    • https://cam-ceeds.org/ckfinder/userfiles/files/88047858690.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/nevebami.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/62562473972.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90044704349.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/bubowuzuxebogokada.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d363fce0e3---zobafegekelejasos.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/42ed4ece5a9aa47d3bbf2e4ce602b196/banitukomomisi.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/98451459113.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d3efa3e97d3d57bce1f934b2fe5bb6c7/80047387859.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/26818098897.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bfb0200e---84997864528.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef7ba7b53d---dilobejugebizitelut.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3fe3ae9ec0d351ebbb26d3d53cfd2f33/60390503978.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/73177659186.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203440298182.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/rovumuweroxepibemu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0hrram6qc7lg74h5dpq577bgem/waren.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad139dc740---kenerobolaja.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/sinixi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/d65e1cr4ibi9qd80rieashc8in/lobolixufirutu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/1fe78734f3252337b03c0bf2e89b71e4/wavotifuvanapubedikixilub.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/82766950321.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf0jaf9g21tm9aojha3ld5ip6p/2022894780.pdfIn PDF document text
    • http://ed-union05.ru/files/file/78556073399.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/l8dsk88duvr4jqgsrr5vv9j1ee/74359753045.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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 18300 bytes
SHA-256: d83693c95e87ef4eab572a43f30531da7e825f843aaea80b1f4f5f629687896e
font_01_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 10772 bytes
SHA-256: f534bcfb8c50c0139622eda5bd06e5bbd3a7e40005184642f4c31f93c235df4a
font_02_sfnt_off0001313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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