Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b79fa7150617b3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 01:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c638d65bb5379d43d2c178082b2dd05b SHA-1: f874269b73441eff9dfb525d79e47a00038be08b SHA-256: b6b79fa7150617b31dcd22a87aeae9c13b6ec4f2f5ff4c1f86e03b3ae1355983
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 as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a network of redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/07543vni2c219qk7e2b3b5chnd/22214565158.pdf In PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/a67502e7e754ec175e820288fb33a046/31906776700.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n7o9catidd60o6f19bl245itld/karudeboxedelelodexoxiv.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/rigepibelobawusis.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///borowivemuravitizuso.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/lekigegudinipozijata.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/41382109046.pdfIn PDF document text
    • http://rentaruedas.com/files/others/losub.pdfIn PDF document text
    • http://distributoram.com/files/file/11373545101.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0228102001625735794.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b63e719274953f4586e02e85f7415a61/zasan.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/58706264686.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/21635530067.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210810_155034.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/615i1eb0uq0ro115qsjdcgeqdu/fudavakisigote.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lotosijepoteta.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/sezalatuk.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/63572788458.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/49249395846.pdfIn PDF document text
    • http://derma-dts.de/files/file/fafofimawuwadidogifuvuzu.pdfIn PDF document text
    • https://jensbrode.de/files/file/binafazevebegusak.pdfIn PDF document text
    • http://lulanjina.net/upload/files/3865084911.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1854aa6f---vekosugumevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=organic+and+inorganic+pesticides+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_off0000becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECB 17220 bytes
SHA-256: 82851c4463629deaa388c8ec90616147a4740540d30fde02a7158de0a093dd15
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 10776 bytes
SHA-256: 8169871eda9f1d78097a30842f34009997caea2155278373b7735d522896c7dc