Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79c7b273d009ba6…

MALICIOUS

PDF

75.2 KB Created: 2021-08-28 10:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6e8103ce70936e09d9e538e4864331d SHA-1: 241d1f5581a4996c4fbd0b24e455a767b45623ee SHA-256: c79c7b273d009ba67acd482fcb24a4a5f41dc399eb74660e158a4001a9de5ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to lure users to malicious sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=things+to+do+in+frenchtown PDF link annotation
    • http://inciboya.com/resimler/site/files/wopuzonuvavopuxebe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4qc9gqhi0mndm229pcjm7mr8v0/52413868981.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xowejijemitirawetit.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kuwolev.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ao3det3sgof8qmk3no6eojo39e/81351071601.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/nifafujapepazexo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160889d62e8d09---konavirobiwi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a858e1038ca727851f948e300998f835/35799925581.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/64645155367.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ef7ceed6---gufokalujitejiluzute.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf977c094f---fefibadijituratofidefuj.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612678cc12503---tununazutilu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0886b14abb57f63b26922aa6169d16f0/77471429655.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/lalavu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609634802f1a7---24669057189.pdfIn PDF document text
    • http://prograsifkalip.com/files/79161133687.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0si1lt28m8bjkekofmqqq3rgm7/zanit.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608506f02ff21---vavifag.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-24/20210624091045495731.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade37d03df---dadulodagure.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/tidefetitojurutevu.pdfIn PDF document text
    • https://temahr.hr/files/90901697531.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/66110876304.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/63973005247.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rubodizaxofariremodoge.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_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 10596 bytes
SHA-256: d44f093591d28945e3f45b5b28d50b7644411486485a362524f458b898ca9bfc
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 15748 bytes
SHA-256: 5ba343fe5a9e0e2d40220ae7eb84d76cf2d43392df194c5dec5852626ae71af4

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