Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa7d876ec3e5504…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 19:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ad1ee0ee1f60a5609de4c5ccc9eab9a SHA-1: ed19303c5bfae0b400cb57527bfe2f464ea43345 SHA-256: daa7d876ec3e55041f1f06e02cf904589435b955e77e55b26874f08bf5682d45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple unknown URLs, a common technique for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gamecoast.by/uploads/files/jelebaxetesuvepaf.pdf In PDF document text
    • https://bosgo.mn/uploads/files/limelonokefof.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/podukanobibozavuwaxiba.pdfIn PDF document text
    • https://777mto.info/contents/files/vopizaraxiwivogule.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62535200468.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/latar.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uice1gumpusc7uu83ug6k4f4em/89499222056.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/gakeloto.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd129485df85f591714ea5ead76b7f82/85397064281.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf9ae4844---gevukowevako.pdfIn PDF document text
    • http://mobiliteit.nu/files/xurerulul.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/28677424491.pdfIn PDF document text
    • http://malifer.hu/upload/file/pitubikokixupedu.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/larazabodeg.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gukazobogozulumofun.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/lowuwegodaxavasotoge.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d177a6ebf8---miwaxaxoragekipus.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/dabadodejetal.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vegebitato.pdfIn PDF document text
    • https://airbays.com/userfiles/file/66015033963.pdfIn PDF document text
    • http://domosplast.hu/files/file/25003042880.pdfIn PDF document text
    • http://fxlcd.com/upload/file/bubefofetipakosoj.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/36465698278.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/66665399245.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109060624034319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=semimetals+periodic+tablePDF 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_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 10788 bytes
SHA-256: d59ca555e14152233251fbf6cb135863301debbe194cb1a68b118c67dfb963af
font_01_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 17344 bytes
SHA-256: c3c1080b09238e777dd88674dba8e709260041dfb5bd3a4fcf0e486e8eb8e2d3
font_02_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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