Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bbdd6eb88bbf7b…

MALICIOUS

PDF

84.2 KB Created: 2021-08-14 20:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c19fd1240d4b59542b566e8ca5d889e5 SHA-1: 3d2e7882c4fe3700c1807afc460f645a68dec0a3 SHA-256: d6bbdd6eb88bbf7b20da859cdb45bf377d5feedeae9e69e137f6586466257824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://catamma.ru/uplcv?utm_term=dibujar+la+cancha+de+baloncesto+con+sus+medidas PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f64d7925e---74514751509.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210619/file/16241307569925.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/168b9b81db3aa6aef4cc35866a5c0da1/84672237028.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/19c3222cf304c01a102c5839bdc1efb7/63502807193.pdfIn PDF document text
    • http://flexa.cz/docs/file/70659112411.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/vixexuw.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/33819862940.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/64404361231.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7f5ec6732a8ef7db31dd364dfeb272db/72531271386.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/50426054455.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc700bb0f4---13035613186.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cce4c6aba5287e36b82c92e2aa0d6ec/45382569144.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/529275d4cabc2352ebc7053272204bb3/wajafazoxevisir.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/68039ce4d76706eefa70bf30dcd12d32/70702904694.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/zunupukuxijuxaj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1788decc5---mevabemorufiduziditegove.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6d739a610bbc447ad7b2a3c16d450457/39621857014.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/50105037499.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/112d23de039c1fc0c817df758a7f450c/mafelijakezikevibu.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xepobonogenasakabufuvivi.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/tanafibitefajakataberuf.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/weraxovusobizitaseloje.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/lufosokodopekogij.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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 11004 bytes
SHA-256: 49dfc03903ea375dbd9adc16166d1a8c443644effcb8beb65fdbe80edf249935
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 17560 bytes
SHA-256: 90b37f72c17b35cd710910789b85caeaca1c627fccaa5743d4355a536cdd5be6

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