Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d296826aa4f047…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 21:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f48f50a3c85fe785bbe98e5d1798fed SHA-1: 3d7b7636afaa39445b3a785b45d42793e3587683 SHA-256: d7d296826aa4f047270a31c193a13046a2a973f6edf9b78475050f0f1ecd1ed1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of multiple suspicious URLs strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a46206714c---15873000274.pdf In PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/41748901167.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/dorakidexufuluxugelujalof.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jasesi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd981061dd---newemo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/topuredenuvipegilesepodu.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/mupeturilumekan.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jdadre86tnoi2e9k9si3t4saiu/85874824040.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/nedexawoxu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6e5d77b---24441778975.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/pitavepelup.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/jazavekixafoxalo.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/gifisugogu.pdfIn PDF document text
    • https://chptravel.ir/data/file/58032067003.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/26704124533.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fb1236f086826dc849545cb0e146a8aa/zanodi.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zuzamel.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7fe2efe1ea0745a2374409bfd121a01e/37525791032.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/15019221353.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/gidowisudibimas.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/75501737037.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109100656183452.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/94242078963.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/44192212880.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ocvcukviifv0jlep3tvd9nk5j3/69001211993.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/93539929395.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/lidotazulasiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=play+store+apk+for+gameloopPDF 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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10712 bytes
SHA-256: b25ca50cad0b0e990a42342003669fd1ce1a87f50e6e8c467458c2b5b66ef0f2
font_02_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 17780 bytes
SHA-256: 5427575143c866b332c24a5e1804ced51737f75e8e0a46edbbfe03f37dc06f26

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