Malicious PDF — malware analysis report

Static analysis result for SHA-256 91635c5e89074e07…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 02:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fadbc5a25539328f8050e9cfb970d1c4 SHA-1: da16da6582e1d3eb6b792a8366c98ee4a591bd18 SHA-256: 91635c5e89074e072650f407d726f125c35627240e5ecb0d820da9baade059d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, specifically leveraging WordPress upload vulnerabilities to host files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63d9762e2---tetisadobaxaxubagowage.pdf In PDF document text
    • http://huspanda.com/data/ckfinder/files/87296925378.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/01/21277409716.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/9425011102.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/32628777806.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/500798243.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/vazolizesa.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/kegotagekonevuwafusuvil.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613eec38de2e3---goxiwiv.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7a17855d808c0654f3dcab80edad93cf/piwotesiz.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/39168442245.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bd90fa7e---23987744896.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tiwusudafamuvono.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jemuwofesobipuri.pdfIn PDF document text
    • http://teplospectr.ru/images/files/dafofisim.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/27910076128.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/gomogefu.pdfIn PDF document text
    • https://norservis.info/files/files/xuvedumipogovipoluku.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/93304694642.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/tavapodob.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nitowakuf.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/72776528914.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210905053010.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/84647872684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ghp+unicode+punjabi+font+download+androidPDF 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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 19232 bytes
SHA-256: 9437d5516f4ad66f8cd3c0e6754a0540a2ef83e7f5c4e612d6e422e965095ebd
font_02_sfnt_off000124d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 11044 bytes
SHA-256: 5f55edd4815071bc63cdde308297a913790f0ac58f7a9a42982a5272ea5fabfc

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