Malicious PDF — malware analysis report

Static analysis result for SHA-256 786749fe43be2416…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 13:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c8bffd8d89538aa66208c59521fcdc9 SHA-1: 9ccc566c8c0e6b694926a601d51ec8381d7d8db0 SHA-256: 786749fe43be241607c71de2fdab5cbc9de37d81fa6fcfefb86e390e1d56219d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. While no scripts were directly extracted, the PDF structure and URL farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://aelma.com/sites/default/userfiles/file/77171700173.pdf In PDF document text
    • https://majubesar.info/contents//files/buliza.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7b959dd0---muzubesadedovugurilipumu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82a716949---46529366055.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/96531128464.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210730_012800.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/mupupizuloge.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tojenu.pdfIn PDF document text
    • http://gtshotel.it/images/file/38714317315.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/61814927844.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/18049588815.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/81973555138.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/21016452304.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/4728359064.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/35089581763.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/limizimekikezo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/warosoje.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/45945311902.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/xawarofajapinutolodejele.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/66384959924.pdfIn PDF document text
    • http://sartor.ru/upload/files/nuwemiso.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nenogifoxanavekejuxu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/39c474b136547bd8a69ae307a14e950c/lebojisoma.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/xewusimomapunebok.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gowozaregilewina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=transfusion+sanguine+indication+pdfPDF 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_off0000b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 10812 bytes
SHA-256: 10b51021f6a58b47d6310fea71f869758d32bea8778779218c6f4f179f469659
font_01_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 15700 bytes
SHA-256: fb7fb6b6dd9fdfdf9d9b3d4ec7de22314389a5f35c9e98ee775775c97622a1ed
font_02_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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