Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dd215fdd341eb0…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 17:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1047372f4eaada3053afdbeb5e656b95 SHA-1: 6d4e0cb7fdc5b6eb1703a88596a0551d71df9960 SHA-256: 68dd215fdd341eb02b612c4beb17adc2c5074dcf76066618cdd294f76fb48a24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to these external links, which are part of a link farm designed to obscure the ultimate destination and potentially host malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/jujopufujomomewabika.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613383a631e54.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wariduvofi.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/nepele.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/32138841730.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/1989448570.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/75642492083.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/4880970228.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210910000206195.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76e12ca05---53112328709.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/92016048306.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/95072764257.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/73150476422.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/texararikubufa.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nagurufizilukigupexemuko.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/25097804132.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/46052788803.pdfIn PDF document text
    • http://nature-revive.org/files/file/12443459448.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/lawetekasezixiluzisukebu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/17308346366.pdfIn PDF document text
    • http://unityproductions.com/upload/files/41632615861.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109090507223928.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/48449065227.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/lerokogemozavanesozerimi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd5172e43---27640024216.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/wifuwadupasenelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+atualizar+o+android+do+tablet+foston+fs+m787sPDF 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_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 19464 bytes
SHA-256: ae286e3c560d74789cd3da5fb443c1ae871e0384683728f0aaf2213dbea4a47a
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 11104 bytes
SHA-256: 9ca906968d0b4371aef9fa57b007a35253547a036ce6ad8688379d6475ed73a7
font_02_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1