Malicious PDF — malware analysis report

Static analysis result for SHA-256 f995c72d028eb979…

MALICIOUS

PDF

70.8 KB Created: 2021-09-12 13:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 823307133ac8e14dc24cc4276c0ebf15 SHA-1: 2b1062f2e22393122806721312a76dfff80d37be SHA-256: f995c72d028eb979972415a903db1980a5476fdea40719b306c03e0187a3e0a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=x+ray+camera+apk PDF link annotation
    • http://aimecostruzioni.it/userfiles/files/noxajunifejegijelisiwit.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zofajidifel.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d4881b47---dibipakowagukimevenitaw.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/poxomunis.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/sawisivatu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d65dc5e36---50488247835.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/fevafomomabujuxuzujur.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/32211095250.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i5d0ufc0o4tfqpqcotg6dkpsko/80001416615.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vumisomasuvenizapab.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/29401656.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210902065530_8xhh08.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/426919635.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pikagu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///48513189084.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/piputirixenobopada.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210909182507808846jw325.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/89929303149.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00fbef1f2---dokudelapojega.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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 17332 bytes
SHA-256: 29f50aeb85745885391be815c5b51d7d731b26dcf9dafd6ef6aba399848ae290
font_01_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 10120 bytes
SHA-256: 64b1b3a9417118e0347e6989c59560c21d4f2ef3a690147fe2663a95e393e8e7
font_02_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1