Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc850dd8ce35904c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 14:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d72ee814104490ebaf7a948343cfee9 SHA-1: 3a2cf16d70494072c38af31937da542d0dbee2fe SHA-256: bc850dd8ce35904c4e4bb63523644245551614a7801080e4765db6822404a260
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to PDF files hosted on compromised WordPress sites. These URLs form a link farm, a common technique used to obscure malicious destinations and potentially distribute phishing or malware payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1306c5b2a6965b50fbe49d9186cba52a/lajenonujamoposiwu.pdf In PDF document text
    • http://derma-dts.de/files/file/1335835165.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5b9e4e59---lujuxobenezovutogotirur.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87d407512---bidogu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ed3f009d---temalaba.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dd38beea3---jepivuzof.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/sivujitamavinida.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/76487171523.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/sarewuxobawuvawavere.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e49c584d7a23245bef23373d20393025/95405211533.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/9307462165.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/gugoxidi.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/redexivigaxija.pdfIn PDF document text
    • http://renovator.cz/files/file/lazavojepibodikir.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/fe77918b41174ff11945db54c3ed8796/zesatawikemulad.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/dadosi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/09ac630be6dfbc599b2d6569ca8a38e4/nuzofurigizebav.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/bikirolelaluriwirasajadim.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firabarojasajemut.pdfIn PDF document text
    • http://hbaoge.com/upload/files/pivasutud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nociones+de+derecho+positivo+mexicano+fernando+flores+gomez+pdf+gratisPDF 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_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 11272 bytes
SHA-256: 54131e7d75c3970d7385630fdf5106e58839946f624bf44a70f024043c8c07cd
font_01_sfnt_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 15252 bytes
SHA-256: af5edd812b3f055e6d54026fbbba3959a51b4d4d2ddc9edc4b0e420bf18b9368

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