Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655b7e8c36e5c79…

MALICIOUS

PDF

88.0 KB Created: 2021-10-07 05:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 07d322b38fbc7d849578b78f421c3361 SHA-1: cf73683388cbf23bc5b63a7f7134307b376bee47 SHA-256: 9655b7e8c36e5c79ae9cb5678cbaaeacabd5baf584ae9e6f10137e6a6ff44d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/7onrcag0o61l1r99vshcar7o03/pofanitivopenetebev.pdf In PDF document text
    • https://planbmedia.hu/files/69436925826.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/kofozaritu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/3867803509.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/87689406822.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jupilut.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gjel1p0rko9m91rrsm74n0l8m4/wisem.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/63072557865.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pojilokeworirutu.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/sijifad.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/28076601924.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109231158443828.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210925/file/44184240019.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/rolugulorese.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150c53fb216c---nowanaduwanabovori.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/kipatumexizuzokamuwexuk.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/vizedilovob.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/gitigutodunowe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161317923e2379---80695032836.pdfIn PDF document text
    • https://sapporopools.com/contents/files/11139935071.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/92837423898.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/balelalidovuxuzibekonot.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/julurawupugimagixibisa.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/nonavelusimokitegegome.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/zepesoju.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/29a39e37abd1234e2277d102f9eb44ff/94607748493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+small+trawlersPDF 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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 10092 bytes
SHA-256: c5683c40c3cf6145724fd162b37763bba721ae4d2d73cd073d786fff37ddbdee
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 19548 bytes
SHA-256: 768ab5c2633d1423e2bcd27b7a0d64de1976cbad02cd55c80123276ba991a15f