Malicious PDF — malware analysis report

Static analysis result for SHA-256 443bcae54a35d732…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 10:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef2833418e142e6227b09152dd03568d SHA-1: 9ede59f322186bb59a81392aa34f333d8503602d SHA-256: 443bcae54a35d732e2c6bcf57c9fa417cc4669f90723139799049dbf05ee4034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=pdf+printen+als+handout PDF link annotation
    • http://uro-medical.pl/zdjecia/fotki/file/selulozejipex.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/rubuvugujinut.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a6a8759792ea7d9f6128f39e2579d5dc/nozupumavevotid.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9023307c9da29ef7c35598d4c2e8229d/10676273500.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6a904a83372c5b1bc80d675d258ec572/pibujokekudef.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/gosojetutetelenop.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/xuwajole.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608085e4d4050---rapubafaziromez.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/caa911c4da785a8cd24ce75e4992ede7/33210330650.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/25873816685.pdfIn PDF document text
    • https://topupdana.com/contents//files/68698999261.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/94062613866.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/12810713324.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/30996b135d368f14c582405b9a154f60/28461350011.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0966720c65---gametalotor.pdfIn PDF document text
    • http://citra.cl/userfiles/file/73483829611.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a039ce89ffd---28822697987.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210809014137.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4df80a8c26---givisarane.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbceea0c85---ronakagokonijedabuxow.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accd9cf041b---1676761308.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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10696 bytes
SHA-256: 26d7a88065cd7f28021180713ea55dc762f73c6fc11526903b8606c27dd07855
font_02_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 19180 bytes
SHA-256: 219bd3ec3c3bb46385e3285c61395345f6acb8c9a0cff872edd7c2c088c13138

Open this report in the interactive analyzer, or submit your own file for analysis.