Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9099524c0fa27d2…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48cdfbcb7a41fc33ca244edecd81bd1e SHA-1: 3174d28ddd735043629aa74ac286e6784953a9f0 SHA-256: e9099524c0fa27d2a585c68b06d7482c7852745e95f4a2344b47db5324895f8d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of URLs like 'https://wastran.ru/uplcv?utm_term=spider+man+apk+android+download' indicates a potential lure for users seeking specific content, which could be a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=spider+man+apk+android+download PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330db95d848---27036068383.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311812ef813---61602076063.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906015028.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109120600569599.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210907_554B680F7CE95B27.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/bomixopovudeseg.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158770a9d7---16514680957.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/27996181178.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/zijunalumofe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/60059162279.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/75278175652.pdfIn PDF document text
    • http://ruihuitax.com/files/file/77437163429.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/87056461656.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/muxiniwadizojotukoj.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rugesolabajapo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/tasufepo.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/8108101682.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/52040229249.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/49886588843.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/41929319430.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/masegi.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/28369422269.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/zipasotuvu.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_off0000bed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 16476 bytes
SHA-256: dcb0380d5efef459e7b7f8fd858c451715fa30423d4a41022e70c901b726fa0f
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 10540 bytes
SHA-256: f7e473209e3d35f084adf9de1603de3982377466a44272f443f691256c7998b5