Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1e5da5887b03e3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 17:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 901a31fccf1351cd09834a722177d022 SHA-1: 8cc7d50a6acd0216017cd5ed45d6cf48b284413b SHA-256: 3f1e5da5887b03e32dbf765f2673d55a5e68bba85fc5d2b7fa066d18f5a347fa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress uploads. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8411cbff0509af8fa83c92448ba55f24/96460620585.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a1edc45f---9624986919.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/xeworetunavumuzarikev.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd0896a370---93982625360.pdfIn PDF document text
    • http://methese.com/upload/files/72180750877.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/17244531004.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/35480970392.pdfIn PDF document text
    • https://invest.pl/userfiles/file/97974143129.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/87659876281.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xineboxitipotezezi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078271eb5e18---nujazatugugaxuzesar.pdfIn PDF document text
    • https://peterdegendt.be/file/75958062883.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108251310065965.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/mopokupon.pdfIn PDF document text
    • http://apvn.info/userfiles/file/7076895372.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/wagasisa.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/57975197477.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/1612232572.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/79718079529.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/noweravuxev.pdfIn PDF document text
    • http://signauction.net/userfiles/file/keratubavifof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=untangling+relationships+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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 10784 bytes
SHA-256: 3b3d9078f23cd153780e227a48cf65862fb770b9b56828350f69a58ad5184944
font_01_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 17420 bytes
SHA-256: c6f3f601f52a7fd39eb06e2b07f980d21e00eb0567515c8d24fb81dd38989059