Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bb504947f39e9f…

MALICIOUS

PDF

71.2 KB Created: 2021-10-14 17:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 118ee61b099a004a065c095ad1f324b3 SHA-1: b4e9acd21b8ee7d21b95694f368d91134a5c4b21 SHA-256: d6bb504947f39e9f9772f4abb2f896da4513345b890f19243dd9a35ffe218797
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress uploads, indicative of a link farm used for phishing or malware distribution. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zezoalza.com/ckupload/files/6314446686.pdf In PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/rutegodigirelurivofaf.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/632640806613af6b5c1078.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/jiseniwedabazusitujeb.pdfIn PDF document text
    • http://effekt-film.de/files/file/dotajaraweki.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/muzabudetusavalolekebi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f9f59a8db25950c15c7a7fa5c8a7d72b/sopudizenib.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/riserusi.pdfIn PDF document text
    • http://hnhappiness.com/d/files/soxosipekibeteguvator.pdfIn PDF document text
    • https://dm288.com/slicice/file/6681925109.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162c6e692373---74134918000.pdfIn PDF document text
    • http://15881588.com/ckupload/files/dogijurejubonagusajor.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hcmn21nlp5lvncjq69h0kfo8ed/zetanegewemik.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/zonubedekobikejobat.pdfIn PDF document text
    • http://yjccnc.com/upload/files/80037591834.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/87032747370.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/28499149712.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kasububi.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/41050831048.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/76631185437.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/darilemusomovelo.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/xutalej.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xatenadeluzojijofozezata.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613471126383c---47064825292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=do+your+censusPDF 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_off0000b841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 10040 bytes
SHA-256: eb5ddd5d8614db7431d80f42dc90cc34d4f254af46daeda3e47a9c8505ee66ed
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 15864 bytes
SHA-256: 8b8e87bc9b18fcec127aec7c46751d37c35a25a5f218f0b0e584f6a26fe457fe
font_02_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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