Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b065e24fbe09930…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 00:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcd40aba90a82ae9a58cec50d15b7f9f SHA-1: d6e063a37c20f7cecb9b66f5626eab958e233ff9 SHA-256: 0b065e24fbe09930eaa30abe4f7fccd03b62289cc598e357774f845c17da4467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are identified as a link farm on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://aathichudi.org/userfiles/file/saramuruzopinozatudagot.pdf In PDF document text
    • http://kaies.net/upfiles/210908043410675302uuh0wp.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/dimojupuwe.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_014423.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sifadidi.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/5540578656.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/runagopaz.pdfIn PDF document text
    • https://senfina.top/uploads/files/finavubofabelajik.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418eb36b670---vebawokofumuz.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/vizesoruwukalupanuvofu.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/pivizagawigejuk.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/60326183960.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08734f1a---87010891276.pdfIn PDF document text
    • https://cecprint.com/images/file/42028108142.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/16022720741.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/13780468609.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ab9c373e5c9a1d5873a9ed35603dfb8b/89111000374.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/11285819352.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4ae64411---22370938498.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/46108559664.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/18817836140.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911011208_hbb6ka.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/90742603960.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/51433568809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=teenage+mutant+ninja+turtles+out+of+the+shadows+full+movie+putlockersPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1
font_01_sfnt_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 11504 bytes
SHA-256: 9ae8f61dd7a6b79e2e116b1f6c1c655ebea4715acd6582cb62d04492c14d5c7b
font_02_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16772 bytes
SHA-256: 69838b43c16073bd6f4ec5971b14e8a6cf6947d9b74ef164ff79f95e41459887
font_03_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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