Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bef03ed9eda744…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 06:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 106b4c2a4f1d66a78d8eed56d8a819a0 SHA-1: 9dedd3546887fd83b6a2ad9eef6f09264d03c900 SHA-256: 83bef03ed9eda744414395ca3ec2615cdfc1bb943eadb13dc508fc1a9b8f4c0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=connect+a+ps3+controller+to+android PDF link annotation
    • http://traiteur-ribot.fr/userfiles/file/zojowepinofupetivove.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/578def2d9575f75d68fa53631aa12139/71426420544.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/42983853777.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/11083927626.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e17059d1a---27702404952.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-18/images/files/8261993197.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5dc44f3b80749d933300f39c877b3650/kajoboxivigizuzuxuwitela.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146187c4ff57---lonof.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/305712795.pdfIn PDF document text
    • http://planetamama.ru/files/file/65424859682.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/dakikinip.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/61878845111.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/55945178846.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/pejivemorarutaji.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/90517848904.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/kuzekukabumowak.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/96431974847.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/97767484286.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/fudedasu.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/64904712928.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1729c21802187714f35468a29be162e7/jiwupoxelonixuto.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/jumiwo.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/29279306261.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/98520786859.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_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 18360 bytes
SHA-256: cf69422c7e63e67e4bbbbf0853833fe3cf6845ffdee6fc7640873216244de397
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 10712 bytes
SHA-256: dd464be1e7712dea2276a038fba6f86ca66890b9c3cc5d31859dedff35ce61ac
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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