Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f6739070cf3abc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 23:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 68644584a0e61914e6fa67cd30813680 SHA-1: 1dbbf1159feea2f7befc78241e5c999aad02303f SHA-256: b6f6739070cf3abcc200afe6994adc55a533525c3f5598351a12ee1bb1a933ff
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=photoshop+keyboard+shortcuts+mac+pdf PDF link annotation
    • http://sgyscom.com/upload_fck/file/2021-6-23/20210623003139373420.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/jogufododit.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/kijoxovesasovesufadalawo.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/zemelap.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/majagepenulo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/12852470537.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/nuxusuxutikib.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818548e0e64---45047433443.pdfIn PDF document text
    • https://computerzone.pk/file/dewixepewe.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/jagerugidakovexixugi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608133f06fd88---birujusof.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/kupiti.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/52444786174.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/28036888341.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/9523425418.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/waxijif.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/kofovavojoxamusijeja.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/58781826304.pdfIn PDF document text
    • http://renknh.com/ckupload/files/124903184.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/lasemizibalibi.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/53919460538.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/visuxuxoperirovilodab.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/guresoxegevetuwilajezu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pckvj1358kn3bs69huc4r8ch5p/podolopaxurakiga.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 11088 bytes
SHA-256: 0e86878b37cd7438b3bc937a54a5871f2809b2cc363881f84aed2ac4a6902b88
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 18228 bytes
SHA-256: ce52c5cd2c57b0cf26124c898fff6e4b114da1a8c82b1dede6918e06bc6be16d
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1