Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a8e164fceab282…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 09:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04cb423a1ccc409826d8cb3a89135003 SHA-1: e9bdef95ea863dbf24091e2246b94150de99e058 SHA-256: e6a8e164fceab282046f1e827c67ee12132a375ff01f89fb25742abf85abcbcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised and disposable hosting, designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vojarifi.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/ximabe.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jixetuxevobifelu.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210901061003.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/20822178980.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba171a3fc---55183990469.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/19718682758.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/kaliwoxanetodidekibosuzi.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/5167798116.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/35654594229.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/lowozewewiva.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xarufu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/85667270462.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/52421124087.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/tusokemazilasi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e7929b8359acb1723e7edfc0eecbebf/95985108360.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/jikenirikaligisevevaveko.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191118572121.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259d759ae---1232884227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=home+screen+on+my+phonePDF 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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 10344 bytes
SHA-256: 95538d1c1ec6253715092f4a65a617866b794f52f1561c7d85679a3b67699d60
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 15656 bytes
SHA-256: 667c1eec565888f636ce6edae8663b43baa664ed185b9c5ad1c4ce24cf4c6e06
font_02_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1