Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc6f79487e65c4b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f8ac11b31d0214d99c789daff850c8ec SHA-1: 2c53ac38d5a7aa6b264ba8ad41b1d09348e1803a SHA-256: efc6f79487e65c4bbd1b8873bfc2eecf905573b15a1a3aa2b51d1fd47a1e45de
196 Risk Score

Malware Insights

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

The PDF document contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are changes to payment or banking instructions. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://coretry.ru/uplcv?utm_term=omg+dolls+names+and+pictures PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c838192b0ae5980898715cda34d0328a/7804752346.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/nphqhhub0v7r8ihpgt6p5h3k35/metopatatijofiraweje.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607806056301b---26499116358.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2a95fedc---nuluzujunujolisuj.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b503c8ef---48577206951.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/doxisuge.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/rezoremevigebigiziwijakad.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/db9ms611q2m1bemust01a9dg0u/11872250469.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c00709207cb---weligawerede.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff90a79f1e---wepevasetaxupinotir.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/becec29f3cd4843ac2b47844568e53c5/tizikotadolija.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609404517b467---vesafofu.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/lonojit.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47508000276.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/087e23a1551b356a8b79b93772affb24/48851865157.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/18d4eb2fc06e11407482c1eeb75f690d/60931455621.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7e9e30bf---xigobemufos.pdfIn PDF document text
    • https://digireg.nz/upload/91086513445.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a566da870c011ad839fab0ca3fd83dec/19376223689.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/14114147765.pdfIn PDF document text
    • 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_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 16908 bytes
SHA-256: 68bfd64af2ae78a768fd04d0e679b5ee045537eae715b9d6af99dbf4470dca95
font_01_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 10984 bytes
SHA-256: 70ff3f728dd87edd9a81cdcf29bc7c5f890b01a16a84ad8cab098e88bca07d14

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