Malicious PDF — malware analysis report

Static analysis result for SHA-256 45727e2eb93d5b47…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 16:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5114e77124c71a4fc9703f7c3268a9bf SHA-1: 18a974f73be4c24cd003b624f3498df201b7b206 SHA-256: 45727e2eb93d5b4735ad919a48234cb7e6f35981b9c3228ac697b383f3bb96a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=scary+monsters+and+nice+sprites+midi+download PDF link annotation
    • https://luminex.pl/upload/file/29207070124.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/tuxaxoxomo.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/xuruloxof.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/51168170941.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbfea0622c---xiwobezenuxananaburopibaj.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/mowisomu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/tozulimozuwotedatem.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/getipujozofajugo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4eaaad326f01cd9f19cd517aa7e9e667/36225377067.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/76b8c034c9bb230c8e8f83898765a9b9/92916280326.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a578723a6f4---66313965519.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/64162749806.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/75192e085bb03c0c8b343d08c73668a1/bidotodekadozataje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05f0ea7d7---60537952478.pdfIn PDF document text
    • http://hrudolf.com/userfiles/63453028149.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a3f401e51138ac76003b29ae7453eabf/17882954743.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/wowemik.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///35893259454.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/88080925425.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761274d5853---32199055989.pdfIn PDF document text
    • http://zeci.nl/im/image/41661825736.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xokekemivegiw.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/zapimufusukezesilivuw.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_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 17732 bytes
SHA-256: 651f91b38afa7b01cc21787351a02e681e352bfcfb0f4d68097e397840795d2e
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10952 bytes
SHA-256: 0dee2828ae472453b4e1a1850d8227271284670f6c817c7c561c17665fd62f02

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