Malicious PDF — malware analysis report

Static analysis result for SHA-256 759554c0aa8f4ec7…

MALICIOUS

PDF

88.5 KB Created: 2021-08-03 13:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fb5ed1c653db629e35d57b0de201526 SHA-1: 87b08d845dea9bfe326d7700914429901f539f6e SHA-256: 759554c0aa8f4ec7b5c72974fcd3491cd5c813868de9e5616be2f7fcc8742aa1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a Business Email Compromise (BEC) lure. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates the document's intent is to trick users into changing payment details or wiring instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=how+do+you+fill+out+a+stock+ledger PDF link annotation
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e2440e41bb3445af768bd55b4debfafe/sakelikebejarosewesagifu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/mujulefiki.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/45b94dea5ff05f772ca4a4d29fb5f540/23503986020.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/88237846957.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079019d0cfa0---44679746831.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad58531dc5---90186237542.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fojegamitajewapimexowebad.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/be4ee7c65dcc1dbce66c1ef9e3f5bc54/putanexebajazuzubetajudub.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/sebatage.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b86cc963abf---82228396621.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/58810689047.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/58184383125.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/78855096879.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4fc4ee87---46968172022.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/596f87968066d74c8ded7ac665aa38be/61098981966.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/64652823743.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965d53d26b---dumas.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/pr1nr1llm5vt4bqv6lb9s8u2o7/1689293220.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7db598cf3---24374204093.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/junatakadoterowerifojupi.pdfIn PDF document text
    • http://webursitet.org/Files/file/58923574003.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kusadiwowox.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/wanazovapazo.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_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 16552 bytes
SHA-256: 72a1e65cf898b0c8b858cad7ef383867a804f889cd243e83c2552aba7984df6e
font_02_sfnt_off00013893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 10928 bytes
SHA-256: 4cf2df1f03c6421bfb0b3c3f3e6cac1a73f7465713af4e51e52c17209bd1b1d7

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