Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7677d8cea90d2c4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 21:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ff8aa98b47dcc6325486511070e0acd SHA-1: 54aa94d22f500f1d63b3f6e22cf8f913b01dcc9e SHA-256: e7677d8cea90d2c423adb09006df7aafc81c3264504c440e87e210479db004d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=automatic+call+recorder+pro+apk+free PDF link annotation
    • https://hotelite.in/userfiles/file/votiferilojedizike.pdfIn PDF document text
    • http://boldogelet.hu/media/74578619640.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lonemizozinesuzoru.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/givipefipila.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/fazipumozomosusi.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/gikumonid.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tulapaweboxawavofogipopor.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/18223199189.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/98835699752.pdfIn PDF document text
    • https://intersat.lv/files/file/wivigunikalufegivom.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081691b42d---furowuv.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/99672678946.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/takabarebuxos.pdfIn PDF document text
    • http://ijfbn.com/editor_up/27643440743.pdfIn PDF document text
    • http://rhondachem.com/d/files/wunewimawul.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136b45081e3e---garozegomuwesosuzupom.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2f147fd4---mijitebimak.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/20181627859.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/69992096225.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/savuguvorovinalasokamun.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109052331144756.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/xarugaletapilefuwew.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/47476811984.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/5952683668.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a54d0878---56156114218.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/25318332825.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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 17620 bytes
SHA-256: 05679a79caf1cbf960c19cb88c0759e7b9d39ad54f17636626f6ea2f82545718
font_01_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 10680 bytes
SHA-256: 52adf0462ee4d7369dd16e66fa9c4a5042a5dea93848206fb31acc484f712342
font_02_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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