Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b3a90063932178…

MALICIOUS

PDF

85.0 KB Created: 2021-07-20 18:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99e4aec3223bcc7ed11a280630761594 SHA-1: 80ea0590d7cef44728a193c6c7579573757d5938 SHA-256: c8b3a9006393217825a3f37b44af636d16137be8e0079aa1140098d282062858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting domains, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://zubrcup.by/files/files/97312977849.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7f4087374---82282754640.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/kaviwaxugudofepedugokukoj.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/49385494295.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e9866d04759---36889006877.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/36965984248.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/tazora.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a0ff2c414---39248100531.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/jukukifowapesezegifowe.pdfIn PDF document text
    • https://banghenails.com/upload/file/38624872579.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b6c418db175b2d8afb960dc5692ecbd7/zewafiderazelezutojeva.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcce9b9d9a---49178179137.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/folepikutilusapis.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/zikidotoleluwaf.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/788c2bd6a03eff561101e6b17b5bc695/mupabekutuwerufu.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/30725676839.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc801230d---fuxazaxerop.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fae1bbe33061858bbeaa5e1d7e1259c6/putalatiwijud.pdfIn PDF document text
    • http://emaaravm.net/upload/files/vonujibojaf.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f19453bb61d---99493025999.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/58952519575.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/62646912940.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9207b57---guxuledozapukapozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+iron+man+face+easyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16824 bytes
SHA-256: 85a876af84b3379eebde3a5fdc382e78bc45e96c6a06eca76bee7849308fc934
font_01_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 10780 bytes
SHA-256: 504122ae63a9fd57ed844a10a9bf6161a5e665cdc98fdcd8585652a59b76ac4a

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