Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e97d646aa05a546…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 06:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8329c52bd00aa6970b8a0cb5475801a3 SHA-1: b13a7e7575cfc462e26a79303198ea23c40b5dc2 SHA-256: 3e97d646aa05a546b1f979ba56bab688159fbe57147d4a3a130b95a7f4e65f0a
156 Risk Score

Malware Insights

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

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 numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm URLs strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://africareview.in/userfiles/file/jurinidexuxokezudu.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dd70bf4f69fde905ebc97b94c3ab677/8615291385.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16134eeb094a79---28846043832.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vamoxowixubidatovu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/43024545281.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d9l5cja58unsriq1eoalpvc35e/55765097771.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/52988934524.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/faliwoxeful.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/xibotanutokalosisiviz.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/fezebatitop.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/sifaguwisotezemawokewojob.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/xusenibadilajoj.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vaxuzavobu.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909165503.pdfIn PDF document text
    • http://ruihuitax.com/files/file/70764151259.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161369bd82210c---wukugunogo.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210908141057.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/37001721072.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lazepevigagapef.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/tenusodusufolepup.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/34167190693.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/81693999381.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/50924956018.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/94731442540.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614119c22f21f---pozupuzomogomuwokaneduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=final+fantasy+vii+android+downloadPDF 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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 10460 bytes
SHA-256: 444f59a7cf31549957a6224fbf3afbb9f98ea2edf97988cba30731b5057af38e
font_01_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 17420 bytes
SHA-256: a3956e6a7b492ad917d97e79947f1609ab03c39595b719a7123f82cca2338910