Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c63ec0b2503891…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 14:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63a80862f8adbaa8acf6a058c9719abf SHA-1: 439dda59d3e75f9dccdce24c4feccf0c4910d8a2 SHA-256: e5c63ec0b2503891597004fa14b7906b196c434d0b5c782f124524778f8dfc33
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://zoncmswebsitebeheer.nl/files/editor/file/daxipitafopi.pdf In PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cf2dadb5---75876748644.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/28648466696.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/30366328753.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fovapob.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/94023947982.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/fudezurovapovutewaluril.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/pitokupovusapupoxim.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614137c52ba0f---278972539.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_050012.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/89049435467.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/91839469996.pdfIn PDF document text
    • http://only-svet.ru/upload/files/99668274306.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/tapinemutavuvabu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f464af69---14225621384.pdfIn PDF document text
    • http://gibisch.info/files/files/74756636156.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/parowelafeg.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/woretuz.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/14269651766.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/28664002552.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/fogurolobuv.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/xokalijejenujopere.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/vinid.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/32598897563.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/9768602680.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210919040039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=thor+2011+movie+onlinePDF 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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 10268 bytes
SHA-256: 74e86a0c5fcceb57e04f8ba39cc0e331a6ed8b5f79c4741740005bc39afd1f48
font_01_sfnt_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 14120 bytes
SHA-256: 81cc9c38687737a3857cfe146b90be34777318285deb3da9ea99a6114641717d