Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e215213e7e68f8d…

MALICIOUS

PDF

94.5 KB Created: 2021-09-18 14:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c059c6325afd0424572db16e5b2b1846 SHA-1: 985b731dfd92df6355182c3bd4f61907b171f32e SHA-256: 1e215213e7e68f8d0c429717d488162cea08e7cc161c7460c7d8c2ac0a673f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for link farming. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=a+christmas+carol+stave+2+pdf PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/86919985159.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/91966087531.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/lujosek.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/napunus.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/43816583604.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136080a5f6e8---subefisamarozepix.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/xuvuwesugirig.pdfIn PDF document text
    • http://101balkon.ru/upload/files/bakimilobawadure.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021916103224907.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145148f8ff47---temobuj.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/12644413341.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vubikebelikatab.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/8387132236.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/tufexatukegisukimoxudude.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109180236137423.pdfIn PDF document text
    • http://artdental.hu/editor_up/nadum.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/im2rvaptfkddgfe6b0f3jf7c24/81868542178.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3adac7924b6fd3f7fb7a3cbdca14f6a4/51611671858.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/4776582862.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/35290053825.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/59094368345.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e246862cd---69140253000.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908025229166097.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_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 10948 bytes
SHA-256: 01a1d1fc3ff9fc05fb42c2781f1fb592a491f3dc6cd52996bb3cfff921fb716e
font_01_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 17296 bytes
SHA-256: 853e7637afd0985fd43fa740b4d5f20c955284dd4738d6ed5a3c192fcf8db9ac

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