Malicious PDF — malware analysis report

Static analysis result for SHA-256 93638d85f046c441…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 15:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11d9e4eb060b040e4863cde83cf4afb4 SHA-1: 67faa7ad1a7827bd19a880b4e203f7108b773999 SHA-256: 93638d85f046c441349622d58cf40d3de275fa8205876c653f94c77795e155f8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://huntic.ru/uplcv?utm_term=download+sat+practice+test+pdf PDF link annotation
    • http://tgroupsrl.com/userfiles/files/78013352648.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/15611001090.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/muxixarixomutulalevi.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/49356091020.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/53110381943.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/26971516378.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/korefogajenavexuvakusejil.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e2134bef---gukoxabekenadewe.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/86183979279.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/24149a677ce5c70b00c8316861986902/47250693711.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/60715504291.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090613365073499.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/logomeg.pdfIn PDF document text
    • https://turbooto.vn/upload/files/nodugug.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/30451785330.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/fabar.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/neduzexubepuvimun.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/9497601508.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/duzurizagafuwa.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/moepmqeo7iba63nhj1o9lbihi5/mezumerosawakadufuvupip.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/zepikuvipemotixisovefiji.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/52a8ea6d8561c2d625d9d903261e8553/zopijifumokifopevewix.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64286119709.pdfIn PDF document text
    • 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 17760 bytes
SHA-256: c9227d472a8cbfcb6ecdb7578cb30f2db736d2663afb9638d29f8cddb66d0f38
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10700 bytes
SHA-256: 9a0ef378338cc6217db00c223325603bd5a7b74122366ac44731b131a5840252
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.