Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c85e6682e99dd49…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 16:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bd7a7c34eedf7e41454780e00023122 SHA-1: 04a1d3a5bde2629ec203af2c8673f1b8ee1cbd4f SHA-256: 0c85e6682e99dd49120f62fa17a157c19e790f1eba2d20f1c13e4e2a6e798765
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://investgeorgia.ge/userfiles/file/44470136755.pdf In PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/89103962122.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137affd6a146---79703144127.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109051518173024.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/pudemanirixovepapukowab.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/jiwuxulalobazobafut.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lizowipubugatobizel.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/talazilemi.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bokitanepedozarezobe.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/zugunudufos.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/gekotutipijigosixusel.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/9995757314.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/21390963791.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/tapegekasujajodekenibu.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/lavozopet.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb9b041dd---vedigibikifovakugumumerex.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/todubasovu.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210916033325.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/nesigojelagifesazusapugin.pdfIn PDF document text
    • http://lex.tj/img/file/59598935627.pdfIn PDF document text
    • http://w-mill.jp/images/file/bawimojapilul.pdfIn PDF document text
    • http://sbcnepal.com/images/file/11121317295.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146311ef136a---79586706962.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/j7k67hi93depalnn8erg16bnn3/meloj.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/48768197764.pdfIn PDF document text
    • http://khocabien.com/uploads/files/49312779785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=infinity+war+movie+downloadPDF link annotation
    • 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_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10564 bytes
SHA-256: c2f404b88ab58b3f61961db05775775254e521ba646381ea1b482d36a641b2ca
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 18132 bytes
SHA-256: dca320371da64f1dcbbd86e211b46a9e508784e59409b3b8c2a0c38f23ab1137
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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