Malicious PDF — malware analysis report

Static analysis result for SHA-256 9669fd3fd678e38d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 16:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 169d8a8c1c519a883aa1cdeea0f9373f SHA-1: 6829c4e4f933a70a0cf19664eb8343a566d5ca92 SHA-256: 9669fd3fd678e38d4a887a1bf0b3bad5c6770eab9364c08f827c8d69417e08fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://kvrhousing.com/uploads/penur.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/koramazamifodowezagusa.pdfIn PDF document text
    • http://portableandcool.com/files/files/rerofategitegeji.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/61249348406.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133372c6cd2f---14893163740.pdfIn PDF document text
    • http://93564497.com/userfiles/84785122627.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385475acb08---99907664254.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/99385030693.pdfIn PDF document text
    • https://panama4d.com/contents/files/nuwojiwunuzimeto.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/86319719825.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pevidofejoremap.pdfIn PDF document text
    • http://szpk.hu/_user/file/88924760931.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dc137ab8eee2b7e6b9ce1fcffb38e098/83306969701.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904193138.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/87952365334.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7gfc84kl3c69d0hfhvt2uabb92/logikoguvuvagekarowadud.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613002d626b8f---95299034369.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/53749600776.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jukulamenimakasoraja.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/medolibopagutudiv.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/mazesusax.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ec4md8i4ivcl7qttmf5jl9eepg/jotamebugirojuxiw.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/detogotejejamunapebomuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scholastic+scope+drama+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10856 bytes
SHA-256: 3ed9861a5df539449cfd949720eff56ffd447da56560dc12a9563b85271fcc11
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 18244 bytes
SHA-256: cc7f1453dd80045995f456f667a0c8cf4507edafbd67d4db61647e58248ee9da
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1