Malicious PDF — malware analysis report

Static analysis result for SHA-256 844b516ddd0d9796…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 16:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1937ddb1e7889b80b2980753c286ab7f SHA-1: e8fa6b9e35fc5ab2541db533d8973ad6f6079126 SHA-256: 844b516ddd0d9796cbc93031cfe3856bbcbb6698083e5b60b4e62b2de2b93166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into phishing scams or download further malware. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=setting+up+a+paper+in+apa+format PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109017420530---50623126006.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c496ef83d69---bedomajolijepetiko.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/bc333f3cb6bb4f09e63be7cddeb5a0ef/59787094922.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gomufiramopukesukel.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97236149411.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/460ab89f075123dd17c79c9adc7e5661/raruximejufuzo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/56044521705.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b1a6898ce9911effba3e79fce11d0bf4/66824101033.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/detidogogutejaguzenag.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ce53bcfbb9634565cb9a82502b1a48b6/mipusugulu.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210716092450.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/suxupitazawolowijisamato.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7dca96a04---kebob.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/92237400849.pdfIn PDF document text
    • http://sakem.org/userfiles/files/4821139293.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021060715083470554.pdfIn PDF document text
    • http://araonline.hu/uploads/file/rowelesafilu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e1cb67ca---rilatinu.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/19467323629.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609333681c981---jomixufumaduti.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/wokeruwabawuronagokeza.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/59740126764.pdfIn PDF document text
    • https://le27.fr/docs/file/kowebokavodafel.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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 10660 bytes
SHA-256: b22718d158d20f00dbc3d2b455c8bfef1666453c2a508b86f8d9c8c114fd5ddc
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 17520 bytes
SHA-256: abe111fbec61b510031d874b4622dc07dcf9f4502adfeb0bb901021d4394494e

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