Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbd8eb48367a899…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 22:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91808cb909a882e4cb38ef191aef7653 SHA-1: 0cbf410e1c97f0afe9e5db7d56e2b88fcac24150 SHA-256: 9cbd8eb48367a8998029e87a100e241d4ac3d75e5308c0d4528e96150f398670
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://midesignvn.com/uploads/files/bipajirenoradof.pdf In PDF document text
    • http://newcityhk.com/userfiles/bixogotuvuwigibilokov.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/besepujikifafate.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/larasarisoxemojuj.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/22345439968.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/db9hkerfpqva5bks4sqmoljll0/fototudogode.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bcce12f70f2735b0b049b6ea2365306b/sofopebepigot.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/49475408400.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/79qud17jknvj13kju1sf6m1a36/ribonojod.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bemikuni.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/giratam.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/91998679802.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1d2cdaf505c50a158e4c39022c6ee37c/gisin.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/wupok.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7mhd84hnst7jg89fipf1sqj0e/jukovufibinujijafofele.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wotimudizenijovede.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xibevixijixewanuxoz.pdfIn PDF document text
    • http://juncheng.tw/upload/files/suguwaxixufotuzuvebufage.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/dobasapeloxewininir.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/dikokofujimotunaweguki.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/volivisabis.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161348b9ec7b7a---nosenured.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f76c7465a---92530532878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=muchos+maestros+muchas+vidas+pdfPDF 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_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 18108 bytes
SHA-256: 6b113404d35a5c6c45c64a62b0b04b93109277f5dc275833e46302d45da2cd5a
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10896 bytes
SHA-256: cab40047e1b2c2a654a023c9fbfa39e4c4ceb8159c99e32e2caf22b0d1ddb69b
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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