Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5ec91d5bc474be…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 09:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c289304257b98a984e3ca3d65db704d SHA-1: 59f1c6eb03bfe7b7a524d1cc96697de42f0cd78f SHA-256: 9d5ec91d5bc474beab63e57ac002832729203534ed4cb77b0486c11d8f8eeb1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=inclusive+education+pdf+in+telugu PDF link annotation
    • http://aitrans.org/UploadFile/file/F1202107272329123552.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623cf4549f---zipejefejowene.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d837cdc0a---tojer.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/gifofulukavumesodusek.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607349fb36aab---binufumusifovizovawenevut.pdfIn PDF document text
    • https://soechi.net/userfiles/file/xibobabomagapenuwamutaman.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/50865978862.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/11948857677.pdfIn PDF document text
    • http://belloverde.net/emailer/file/76344847682.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/lomiwigowaxapupipiborox.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/23657588326.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3142b0e5dc433580ad4655ec6fd12229/fomusejuribemowis.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1d5d506p1sj91rclfkg5c1m05g/98371765066.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/79032614337.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160946faba2735---74687644404.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/kinamarotevidabubawa.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/vetukurebone.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e3d156e862fb7e57643f2e20ca084810/4927828756.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/lekawetamisixaxerapite.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210907_ABF7090742ABC5C8.pdfIn PDF document text
    • http://poorclarescork.ie/images/46306896380.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 17508 bytes
SHA-256: 9cd79caec1d0abbe6a4bc8141efb5d1e910568017f871b9e9b010426330e1bfb
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10812 bytes
SHA-256: 7baee463259124ca85ca247a61834464fa36d7568d9319eac1612f190371f37b
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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