Malicious PDF — malware analysis report

Static analysis result for SHA-256 309addf5feee210d…

MALICIOUS

PDF

97.6 KB Created: 2021-07-18 22:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67a22e8ac0d078c57c52ae7b44c75dd4 SHA-1: 7443f6e320cf456fb1428a27671930cf48ec8961 SHA-256: 309addf5feee210d5aa17fcbe9a83b64665157e35d84aa58534962497e100d7e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content or further stages of an attack. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/mupepun.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6fa6fb73---82219573047.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d1d66ea0---rutebizefoloxunusulo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482828791c---wabadujotolukilofuvitavop.pdfIn PDF document text
    • http://quatang3t.com/upload/files/35413365196.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a6b9de06f01baf9d5015977ccdb8b52e/vijufexa.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/30840896599.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0h2oueiha6r5og0darirf2eq36/sokofala.pdfIn PDF document text
    • http://geose.ru/userfiles/file/15692073276.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96b7bf6c1---litosazumigijusu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf9534960---rinepasijisilal.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d47hc2d00cle04cfknn5ucj8ks/xulekafa.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fezudinofezafakilawaf.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d99774da11---bined.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/52279748604.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zunemifemafitopev.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db01278bba---23644342135.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/75f6253a88bb7fc8359c286ca7ea5c38/15691779432.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/69289305009.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6bca5826c---pepugosavesusokuge.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210612_163749.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/19015667146.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/zejedejixinikizavexorezur.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/1318438190.pdfIn PDF document text
    • http://kids-ex.com/84563014055.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a00cc22b0d0---1122993578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cat+paws+at+waterPDF 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_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 18172 bytes
SHA-256: d795566cb6c4935b534b484cd943cf90e3078e0350b49ac8570ac2303e2efa62
font_02_sfnt_off000162b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B8 10000 bytes
SHA-256: a42aa1345587f5a49d20bb981cd691dce45a82610f7cd2efbd87b37a9fe77503