Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c2d8497fd8edd7…

MALICIOUS

PDF

97.2 KB Created: 2021-07-31 17:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8269e812878b3e24f6df28de3c7b3c1f SHA-1: 4bbf319c4cc0d0bb7cdaa79773ddc9c0cc3f4c11 SHA-256: 42c2d8497fd8edd7f099cdb09fa1ab8d20bd5f4bc3582a7b9f3543d1ae6ad472
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://studiomanzella.com/userfiles/files/66583015393.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e896260687d---22480177741.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4d9adda33616e54dc3092a18328e4d37/demanuno.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/26/file/20210626_060022_200.pdfIn PDF document text
    • https://anaksemut.com/contents//files/78532553638.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8e5dd3be92bd7941543ef88ded070de4/86949919862.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/43325926714.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/17725294576.pdfIn PDF document text
    • http://ccsl.asia/files/paropagovag.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k07okalupir647nfglo7fdi3n1/kewune.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c4808c4506dc5d53f8f13be66f406b0a/6068625147.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/zajuxuvo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/145864dacefcaaa634b0b0a6467c3c65/63522715623.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c73878eb932---mizagofixujin.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u15heplqosb575u4u02apti7er/nafinexami.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb5fb36f32---72743544840.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/81237134103.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e0c6d7876---dexexopawisog.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ks9bhu9oi7ej6v6grssg5oce56/41112687355.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1843hjlv657k99f7ev2ti5cjkj/69138624654.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623143515.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gerolel.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/7t53hnalfchifqfefhdp8nvqt7/35546177628.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074634c3e392---97891989966.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/61215185986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=laberintos+para+ni%C3%B1os+de+5+a+6+a%C3%B1os+para+imprimirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 18736 bytes
SHA-256: 271ed164110e84343b8e0aaa540509e3366148f2423ff44b78062def2d467d8f
font_01_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 11112 bytes
SHA-256: 4413fa511f8fe4d7f889a4be103b6c7107fcb752c49079ed3a2e3bcfc01d4abd
font_02_sfnt_off00014629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14629 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00015ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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