Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f2cf5fc388437c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 10:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89cb35297ded0388d248f29a7a589e77 SHA-1: 78f9158f0b8d56814892a3346aaf14f78552074a SHA-256: 80f2cf5fc388437c119d4992dc7e36e472d23e387ed01a2e816845eb2f673ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely to facilitate phishing attacks or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=best+free+video+creator+for+windows+10 PDF link annotation
    • http://pate4me.com/userfiles/file/2871432813.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427ad2bf0f6---modarekuvidixelobidegatis.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/55330498837.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/tunefazivavigobi.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/6373097634.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/lexejugugujagomegora.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/25895675428.pdfIn PDF document text
    • http://raczcsalad.hu/files/64029432597.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389d372114---23867151825.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/zixiketenufug.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/61109281882.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210906_4C5BFA18330CB8E0.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/5470949475.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/rutepululugorix.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sotakefesexavunenogiwu.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/96370378325.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/xonobevinimo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tarufajojilifitofikufa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161429eceae85c---77628799807.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/mamegonaxovifar.pdfIn PDF document text
    • http://bjjiffy.com/upload/33927220212.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gefik.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/67777948462.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/44979315568.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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 10804 bytes
SHA-256: 69ae57ecd8bd4daa5e995fe9fe6acae99dc4aec30a1436a6b6366d69d47927fe
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 17492 bytes
SHA-256: d2d945d611641cd72fdc3e0bc372b7536a42e8aad66bef14f8191a909c2137f8
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1