Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3ba02c28e042e0…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 18:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23052cc0a2ab5a669d2da7fdddfdf106 SHA-1: 1b89769ba4a9c22a2df4bbdf0ba641c9ecacde95 SHA-256: 1b3ba02c28e042e0bbd69a989e63fa899eada0697eb92eca31d1ca7e3cf2805a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to potentially malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://briljant-maleri.se/UserFiles/files/65354547921.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/11257c72f338bcbfb131a96c2bf4bdfa/bedibofofenipeditor.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/1501739165.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/dapaleposavozofolejev.pdfIn PDF document text
    • https://thepainter.asia/upload/files/44361450312.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/folunuroziwefed.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138523991dcc---furubewoziz.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mebojutezigikogurusuzivug.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/28824949043.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/67683490227.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/zasepabiviwubaxubakonoxa.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/boxudabus.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/7149116128.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/taxup.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/98482659474.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/49060593854.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153728785fb2---28323602117.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/zokugerejomazipebeg.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d054a27f2e8d5fd5b83fa93a1318ad7f/5789270650.pdfIn PDF document text
    • http://taichielite.com/louis/taichi/ckfinder/userfiles/files/79945952583.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/6676178823.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/notipetusexadosifi.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/namadedabeguk.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bupuxozenogexabire.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/sesufuwajexoxariso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=connect+broken+display+phone+to+pcPDF 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_off0000b3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F6 15572 bytes
SHA-256: a297fe68a95c97fdf97644a7d1ad365eef843cf1b822b1dbe048d12ea8356040
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 10988 bytes
SHA-256: 10cc3d97de5667e557f9aa3c1f041a5eb45131d548c012f86fcb1ed09a90f5f7