Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8570b86c7da2bb…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 18:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: faf4d969908721672bc9b7755667fbde SHA-1: c24f502a09abc77e4392265d9d0dd80fce7f729d SHA-256: 1c8570b86c7da2bb0f7348ef6e060e1fa20aedb70ddcb070da217f337cead04e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39700cffc---46443657991.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5c79260a---timosipadovusobixikirugod.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87db2e1aaa6c7a8467352fabb98d8f2d/wowifozelaxisukizeb.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fb4168d3bdb164ca0e667d2c45d9207c/tuwoxawajidizakuvonuzexo.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e49b4baa56d8f8af54661b9d51d212db/66338467309.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24520ca3a4---38035871806.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/notifejewalowowixudiz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9df1kfrc997e1emob56vl8nhfm/sorifeveziz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3uega33h20qkffisjhqem6sp42/gotuvirivemezuxefisil.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a23d4a736b---76894263489.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/55305026369.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082900b74002---xerobewon.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/vukofazitasenalesikederex.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888eed5b0e5---suwelikimigominuf.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/44174674587.pdfIn PDF document text
    • http://omg.su/upload/File/dubimemurilinuguret.pdfIn PDF document text
    • http://drironcat.com/images/file/fojozasomawavotowomage.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073057bb1804---24895359495.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1e9864e0---64951481677.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6576f6d47b---46083656815.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6c9803b---23371250187.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6487b539b4---99395499892.pdfIn PDF document text
    • http://rilta.net/userfiles/files/72206042503.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hdvloel05g3e9iq6rp6klelec0/xifowamizitugodegola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kenmore+elite+self+cleaning+oven+manualPDF 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_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 18936 bytes
SHA-256: c6e993c6536d7be8eabbc3d0f98168b680cb47f8bd9e404e31f4456fff9fc623
font_01_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 10836 bytes
SHA-256: 30fdb76f8cb677e69315dcaea42799337b3d03320b8de6fff2fd63d2ce542b0a
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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