Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b316697b7bcd67…

MALICIOUS

PDF

80.6 KB Created: 2021-07-31 14:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 47b2b9b0f490952218c3e63bae8adf5c SHA-1: 37474ac294b077dd2bfd13ffb267790ad44c2e79 SHA-256: 09b316697b7bcd6746b5dac6b9dfc65f4898ed914a186c812582f01c94b37deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=space+flight+simulator+1.5+mod+apk+full+version PDF link annotation
    • http://truhlarstvisollner.cz/data/file/voruwukegolifukukukobib.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/39358102628.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec325bb45---wuxodubepiwuxagogojunami.pdfIn PDF document text
    • https://kopari.hu/files/file/51369046244.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3c8b1e289---95941224185.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed5ec5287cf4e06b325add95f814e1a7/pulafewanadazibowe.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/95ogpmg87aa0ksu8ce7gamvvbu/10782691658.pdfIn PDF document text
    • https://mollis.rs//files/sokarerexuditesim.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b84a16475---mekagisesulawotemikuvi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/xakupuxovikawozobupikomu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee0ad3976---zivivotabiwakup.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751df867fad---66379424798.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/xofafatesa.pdfIn PDF document text
    • https://gangnampools.com/contents//files/xudewelunuwura.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4f0b035fccffb0f1301e8a90cbdf1e2d/2268588399.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/2101054408.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/65175444016.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/v77qieorn9mmpgf555c3qn6t2h/55510719608.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/vupefo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/legawarakokugasugopatulok.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/17358690663.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87633201375.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i3pbcm336g5t70b3ifimld4ll4/59809254926.pdfIn PDF document text
    • https://12shio2.com/contents//files/vifivakuxufufujokaxojunul.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/motikaforegokufafevus.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/64788530851.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_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 17088 bytes
SHA-256: a68ace27d6f5b5474f74d0b7a8c37148f6afb469e32a54203334aac803745522
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 11652 bytes
SHA-256: 5acb9dd10cd68c989c93a163d4815eea7f3a6cee345311dce6967bd08e2c7299

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