Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49279f2df338bf2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 20:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fd01b338309dc1f00b967ec8280009c SHA-1: 77160af55aaf735e344f42f10be49b35b6fea5fa SHA-256: b49279f2df338bf296b057c4da26219934602dad24eefd63a08938aaeed35d5b
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=evidence+based+design+pdf PDF link annotation
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/20178bb7fc2b042cf4eecf26744487cc/mabuxatu.pdfIn PDF document text
    • https://geniodelweb.com/file/fagubalasix.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160903503c60c2---dupenotuxixalifuku.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/kezurovefogakoseli.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/27003680752.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160edb55e94ad7---95819157510.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wamegozurebitaluruva.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dd81857fef4e8a13c93ada64b9b38afc/vudikelisalaxu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/76740403211.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e691e31f8fd27c462e2177c128966583/nugar.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/vitumokabesasanu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l9a5l66enimhcuasvdf04gee90/53475191375.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/86479366323.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pigatagorowawuxuzabasuwuf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f602ed4047b5ee888b57bf859c69e957/mitojemu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/barale.pdfIn PDF document text
    • http://liyangah.com/Upload/file/nevizoxuturejexukoxe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd9398be6---nuradapeposadip.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/50464786466.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/16480065181.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/28959716951.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b7fc1551---4773053091.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/sufenefigipezozulijizixif.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_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 10620 bytes
SHA-256: 3a89cf076aa6a4a4d3c10375a1418411f2345e79ea4c59c8bde35af9adefb227
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 17080 bytes
SHA-256: c796578040b250d0af7423eaa1855a467de9e1f69af9c00c4439c33648d3ca56

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