Malicious PDF — malware analysis report

Static analysis result for SHA-256 7341955295ad1185…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 18:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 189322e6ef19fa917ae4cde6a34cab0f SHA-1: 69da2e74e3e0b9d06a9e461316c9c5e3d9baf445 SHA-256: 7341955295ad1185ccf9215f897af374bb2a6d7c7592578c1bb7a4c8933e7f5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161387be258a47---potovasa.pdf In PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/wuzoz.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/mamifepozekemavegizivodoj.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/tuwexividun.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b0fbee45---miwotipovo.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/zevuvusakele.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/vewobowisaw.pdfIn PDF document text
    • http://sjanzee.nl/file/57824583396.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/8719066784.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e890f1ee---50534481979.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/b5c310.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed61e4df05---37598608330.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9461347423.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/59426855448.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/64701527274.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/vomituweviv.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/10872574932.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/merapinagutiruwukoxuza.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kirifep.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/xitojanudamogigitabud.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/95215957061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hotspot+not+showing+on+laptopPDF 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_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 10376 bytes
SHA-256: 3d06084e44160e6efe9440b5ef297c6b9beb87f11b18644a0fe67fb725bf150e
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16928 bytes
SHA-256: d7afbe24e79c8c6ead910106be881584d8961860017443e7b57fa3c54a647cc7
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1