Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c28beab90456c82…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 07:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 12385ab5f663345df71ef3200f9b1068 SHA-1: a7d9e46301fb1d24a3c4c8e6b248c15ee14330ea SHA-256: 0c28beab90456c82a5c2e5d72184cc9d61eac7f022de9429b1366b22b50b7547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://tksvolga.ru/userfiles/file/xaniwisodopuxajokuwuxome.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/92558765744.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210902_AFFBE74C2E41886D.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/mabebujusat.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/83304891340.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/9721567769.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sewiwipisinexijof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14b889f55---mututobobulosur.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fovorinogupusakogeweb.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/f65hrjjr0usu1jv7vem0osvh41/lasezada.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/99563699947.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jasixemunitozojiludikem.pdfIn PDF document text
    • http://epplast.com/files/file/44076426170.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/simevukinawowonexofogak.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/56718479910.pdfIn PDF document text
    • http://sjhtractor.com/d/files/zorubokisekijumuvuju.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/votirexipuvapufitukiz.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/texopofaxogibuj.pdfIn PDF document text
    • https://kultmotor.hu/images/files/29671131949.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/48491029112.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/suvufaronosom.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fcb4125d18855782394822562860327f/sonelitidumuvakebaxi.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/supasusojizev.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/54587546452.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/votikalele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adult+jokes+in+bengaliPDF 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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 10764 bytes
SHA-256: 896997653fda01fe6cc3a580ba7135fc36f48b001cb5ab8dfd1ab3c3a9bf57aa
font_01_sfnt_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 17040 bytes
SHA-256: 68284417766aa464f75bf892420a53ab73ecb5b8a16845b87decf3f952825761

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