Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eec3d68304ad0a…

MALICIOUS

PDF

89.9 KB Created: 2021-09-11 11:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e60e7821f5c45d16a9c7a964e6cfa59 SHA-1: 1e86e65786b2b2aaddae8ce5545f363d8ccee91c SHA-256: c4eec3d68304ad0ac44b6d633e7949dac7271410c67a817f7e7a34b096750905
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate the presence of embedded JavaScript and a lure to install browser extensions or updates, a common tactic for credential theft or malware delivery. The document also contains numerous links to external sites, some hosted on compromised WordPress uploads, suggesting a link farm or redirection mechanism to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elitaliaweb.it/upload/file/46234638050.pdf In PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/xegako.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/60029281107.pdfIn PDF document text
    • http://sql110.com/pic/ruzofimutigo.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/fenepinuxupozunirifunesi.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/pigodeju.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/losaxerujuzaxadawuvozeg.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/roledakopuxipotezokoz.pdfIn PDF document text
    • https://matrixx.lu/images/27409060296.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/mowesivaxipapufujefutuwem.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/lagunetusivawutezadufag.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/97660916349.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zagedokodi.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/pesazen.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/zazekizawix.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/felafo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1b803379---fesijukisazi.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/19747807133.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371debaf7b5---fupefijenufuragixeleresuj.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091008022348.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14aa1fe99---vekijomarejanebode.pdfIn PDF document text
    • https://network-italia.it/file/vavawijixasubesa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gtqo0h6to2duj9jtcn7ng48i41/porabejumovama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=me+before+you+novel+by+armanii+chapter+681PDF 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_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 18828 bytes
SHA-256: 32045eefd44f3c0a64a0cecf7c31453397083a761ccd8d854fc7b6c41a966cbb
font_01_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 11416 bytes
SHA-256: 6cd7de1ce66ff5150aaa5b0ee9d9a20ace2d25172168bbd0f327f11b0ce621cc
font_02_sfnt_off0001400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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