Malicious PDF — malware analysis report

Static analysis result for SHA-256 740104f8368fee25…

MALICIOUS

PDF

78.6 KB Created: 2021-06-27 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8a3599e7abb05be4ca34b48e9605206 SHA-1: a69c01ecae2d561edf883ec50fe4e3ec596a45cd SHA-256: 740104f8368fee2577be6906bb36d9a6e126f9eae7f7210ab7469d6d47f9de42
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The heuristics reveal it contains a link farm pointing to compromised WordPress sites, impersonating Microsoft to lure users. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+find+out+my+windows+password.
  • 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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e8e336eb---45055429627.pdf In PDF document text
    • http://finemetal-cn.com/upload/files/tamigiginepu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718fa6bf8c---kiraze.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c695b389f22---82971661195.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/vosivajavoki.pdfIn PDF document text
    • http://jump360.co/upload/files/20210602151416.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/medulavazuwupepazef.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5928d346---58364562658.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a985e74974fdd51d2706aa224512bb01/83348901601.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/86908e89a5606bc43ac23f343c8606dd/finewigobamokegodegawulik.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/gotunoje.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/98834599559.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/003c77a3632674d2de783f90fa41ed76/zedinupenepovapis.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f664bd0316---22542288932.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd190b1fdf---zikebenubifinumetobadovas.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3e97a44785ef72bf51a5f459db0ef4ba/dosokumimoz.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c7f354fde97d258835a14ae2aeb5d1d2/34255687826.pdfIn PDF document text
    • http://kasargod.net/uploads/file/63065260226.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c981b9146a3---nojupulisabesivo.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/13281214.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074680d0ce90---6013426762.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/ruresazivenonox.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/fawajabedetirirawos.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/bajumukomikulab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+find+out+my+windows+passwordPDF 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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10772 bytes
SHA-256: 13574900081a779cf7056ac937adf5e9d88fe6c0072fe5638bf6e2cdac4a133d
font_02_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16452 bytes
SHA-256: 42c36a45c148b48c017a9978e8717e41b6b1e799ec6fcd20d842e48ad3a96df7