Malicious PDF — malware analysis report

Static analysis result for SHA-256 47097131b618f795…

MALICIOUS

PDF

73.9 KB Created: 2021-09-24 01:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5b511e0dde39df1be718965b502e972 SHA-1: 3c31c243a17d6d51c0355ea6f4ad8bc321b7b7f5 SHA-256: 47097131b618f79543ef39a3830939863e5f9df6ae298c79e97b4358f315cbd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wetetu.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/851c65f1ed2d01e4ad1884af6351514d/goruvubiwo.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/kimiso.pdfIn PDF document text
    • https://remini.hu/userfiles/file/kezovukovabum.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/2527441388.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/77698971936.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148bbba9a825---40356979829.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/44681869043.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/11398159057.pdfIn PDF document text
    • http://unsersohn.com/images/file/levorujaduk.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/31889161108.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/70365906018.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/kevobuxawojizimav.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ede2111331fef9a14feb6d1792816d46/majisut.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210913_EFA39A4CB23E45F1.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/sirowubir.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f5380a43de48b6b91b447ba69bd8b382/98619334561.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/76969531948.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125e4c19a3.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/93534276184.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/20575179112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=showgirls+film+streaming+vfPDF 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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 18100 bytes
SHA-256: 7e3430c2e30092fdec60914e4a819a72fa4cb29539053ccb99466d2f67d9cd96
font_02_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10888 bytes
SHA-256: 23d9342d786e64eb2f81efcc0253789ed2dd63dcb55552cc3a537ca25d88f0e9