Malicious PDF — malware analysis report

Static analysis result for SHA-256 757e83610c941c53…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 20:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33e15dca50199323148a611cd3181664 SHA-1: e650b3898fb0dbf8c76d46c98de4ab73ecba93d8 SHA-256: 757e83610c941c535c4e03c42d3bb845ce715f21374ed94d2d716ba13e9c78b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b67993708---32734413302.pdf In PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/59069998089.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630796307.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/zededaxuluzafudujop.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f47def37---9070480111.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_142257.pdfIn PDF document text
    • http://szhlfz.net/upload/badawelewexiladatuxofefu.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/49299929740.pdfIn PDF document text
    • http://hainfelderteich.at/zekar.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317b06aadfb---pifegivakizoximiteka.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387e3a6bc95---zewag.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/62840261000.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902215157.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/93065063931.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/derezate.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bp7er7pi5gmt6jokf8fd722mp2/46685437747.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/sodufeguxaveweb.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/liwavabosepexevutapibo.pdfIn PDF document text
    • http://marymo.ru/uploads/files/28446366872.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/sokar.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/37418304158.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/32714707999.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/44451066089.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/powisilepomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=star+wars+saga+edition+pdf+character+sheetPDF 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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 11016 bytes
SHA-256: f712bce5cab53c31057c4fdbf1382b0e0baa97be8d3a4b39392550639fd0dce3
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 17452 bytes
SHA-256: 86a29b55b29c0588b0e2b3452d36ce698f6cc1ca3f3c9a8b05dd17f4c73a4cdb
font_02_sfnt_off00012adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1