Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa15af382bbc62b…

MALICIOUS

PDF

82.6 KB Created: 2021-07-14 04:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe7766641cebaa84d6359f402bb00916 SHA-1: 7c5437d721fb02fba63799b6e6936f89b909b6db SHA-256: 6fa15af382bbc62b70c678f825ccd59ef4da9e057236a8cb00b0982d7b3572bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to host malicious content or redirect users. Although no scripts were extracted, the PDF structure and heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fe58125a9---99954750914.pdf In PDF document text
    • https://beautyyaurient.com/editor_upload/file/84191799254.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/56476981844.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/e4f3aq3dkguj19h65oskrrur73/bidevarinik.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/nolimemomepobipene.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/57328889708.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/zevapemof.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e242418f0e---60644702483.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c35d1e401---46232158538.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d592b00b427---samisavapasemofokivux.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a1067a024fda7412c539b35ec89c4785/98833273373.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/wejizifew.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061120040046.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a172646d804aa59e96e2b38c22d7029a/24187802690.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ji61697jpgtqhq6urvce66kpsj/82844131371.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/87369473002.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/38038757939.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/weterofegabojoraru.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/61161946998.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0b2bc2c7a1ee6820594b524558a0aa03/ramujuguvinerasalamifov.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/64232850958.pdfIn PDF document text
    • https://stopserv.ru/files/file/sexesufodamesabasuk.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1l4f2fp6vv4lrmvl5n6a38ufg1/8464493012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=diagonal+of+square+are+equalPDF 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 19552 bytes
SHA-256: ef4fbdab6970ee4a9b23b186e10cc8aaabb662ef5bb09afa6bb0193e0eb252d3
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 10536 bytes
SHA-256: d65c6ae030952e1144c105efc03a87210d1b5c9c5893325609cdd1392bf265f9

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