Malicious PDF — malware analysis report

Static analysis result for SHA-256 33396fbbe3c6e92c…

MALICIOUS

PDF

83.6 KB Created: 2021-07-19 16:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f64816296d516b200e6e78acf22b896 SHA-1: a19c1745ab2893333399c2e6ab6a424ce89c86dc SHA-256: 33396fbbe3c6e92cae35209a11cc9a6220ba2e5bef3f65e7b56167d289496b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bahattinburyan.com/userfiles/file/11063654968.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160901bb770c9d---ledexibupokubu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/aee8301d1240280442fef8b4cd3e36e8/jaladupuwadiwuditonutowo.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/mogezokigi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8db18d12---waxuzatutiwom.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199f7af3be---bijupixil.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070277877e87---begudekesezirufideki.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/muvokususavut.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/70697924756.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jutiwadapapemoroxonuta.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xevujeju.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/2426082307.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0690acf6f---dedogaxibidowida.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/79777339672.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/50173bc750c28194acc587c9bf506fe6/vufuwivisan.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/dojapus.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a409c569d---61186684517.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/zawabugunudazapetivutumu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6m6qa0oqt476vm790rvbtgb1k0/59784867795.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/noxosesetuxakifolibujan.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/juwazixolulunu.pdfIn PDF document text
    • http://clingac.com/d/files/vuzajakilufevosuxixuwa.pdfIn PDF document text
    • https://ultralloy.net/upload/files/ganisutogefetinitozojagu.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/29589617777.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/wexegamukewovusivuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+remove+plastic+screw+anchorsPDF 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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 17016 bytes
SHA-256: 10fc522325c130e1aafb249bc91abb9634466610d34ee5c95de0833d2193e17d
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 10784 bytes
SHA-256: 11f1bafddb26b8ab32947583590787b2fae672b95d0c6fcaa1b4162cb3fc9c34

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