Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ed45e6975715e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 19:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a8d60f227eb2ef3ce40a7aee11215bd SHA-1: 8c3f991229d192a9d51a74f64b8e5554c6360dae SHA-256: 765ed45e6975715ecb2bb70d3d79bcc90b794294e4393140a4edc7791fe8c030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://moriefrusca.com/userfiles/files/74918787128.pdf In PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/68773090299.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/38571742950.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/87629043216.pdfIn PDF document text
    • http://haai.org/upload/file/jetapopidedaxogedobap.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/lafenovewepovugebesakal.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/40634899192.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/pudexan.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22250033025.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/2689773896.pdfIn PDF document text
    • http://mq-water.net/upload/fasaxibefepetipopafejal.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/mekud.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/lagakazi.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/watix.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/48646740008.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210902051205.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/sebejufujusuxejavufeb.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9d3e5751---21224702007.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/bogizisizuja.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8b06364a---83816542896.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134f43028701---41538933115.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/11623176711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=iyan+3d+apkPDF 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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 18440 bytes
SHA-256: e1d98cc3f63c36d7f44abb2a07ff5ab45b2a7e0276d81047ad33aa99a40f0722
font_01_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 9960 bytes
SHA-256: 24d5617e519a1503dd7ffa3dcfc1ce1c9169b2992ff0d749c2e16b0d1c1c3f16