Malicious PDF — malware analysis report

Static analysis result for SHA-256 72650f0791b6865b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 11:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c32f8f50f345c57549b9a9aaaf43b833 SHA-1: 92696640bcdbb15f46c6ad8609cc8e3cd13dd1c8 SHA-256: 72650f0791b6865bb5602802159b88a2666c25d975a637258856b1d0f719400c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery. The presence of multiple unknown URLs and a compromised CMS upload link points to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bkmarine.net/ckfinder/userfiles/files/1630839216.pdf In PDF document text
    • http://telecycling.org/files/file/zutipowazemizavi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdfIn PDF document text
    • http://klaaswester.nl/img/file/2937219399.pdfIn PDF document text
    • http://citra.cl/userfiles/file/96503535652.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/kiduxa.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/vimagitebimekesu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/wazubutabun.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/85890575853.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bba2a483---ledafuronisubika.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/sokaxipade.pdfIn PDF document text
    • https://duel.pl/userfiles/file/feniliv.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130619bc1e34---65288929703.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/padavinumusix.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7283f33d0b7a0ae410622f627727a891/gexemuvuwuxiv.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/54423339981.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/82137837694.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rodajagolazun.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/62675267223.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/63744603659.pdfIn PDF document text
    • http://szm.hu/userfiles/file/43119460184.pdfIn PDF document text
    • http://regcureguide.com/files/files/34043896204.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/pilunuxud.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/rixesered.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/waris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=satellite+shankar+movie+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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10832 bytes
SHA-256: ad4f8509f56c7ec93cb67b506b06777e610bb95a5141626414ca8b730b142ade
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 17792 bytes
SHA-256: b92cd64442312d8fec6f65ab34fa4f464933d520801cfdfc6ea41dafd725dd8a
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1