Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e5e8cacb589534…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 21:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74ac67c2c781d35b1942fa1419b04574 SHA-1: c197f037aa0160e3f79412470601abf37bc87211 SHA-256: d0e5e8cacb589534d14417f8537c62f62049d46c428c0fba7fc65b1b3f8a1621
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd22680d30---79867412801.pdf, are likely intended to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://niboparis.com/upload/fckeditor/file/1630445089_1.pdf In PDF document text
    • http://vstarmp.cn/upload/files/20210903_095310.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/revalibazorimi.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/74673715034.pdfIn PDF document text
    • https://asiapharma.la/files/files/ritoximevanuturafo.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/52573876384.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630654200.pdfIn PDF document text
    • http://keramann.ru/uploads/files/20688651313.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/89285992421.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/61774721359.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/kotaragilepikekov.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/38216437988.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/15478783828.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/xudagodadosaje.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ni5cgsc5405nfif0satkvj2a2e/45684041329.pdfIn PDF document text
    • http://punaide.com/userfiles/files/mopezuxab.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/pojinozigikeberala.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4e7625c498537aabc8dd0361a15e8a36/nufizilotomadivoxokax.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/18265798493.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/26212202574.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/82371093967.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd22680d30---79867412801.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/55397732835.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/43192235987.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lowubabididibosuruvep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=zee5+app+download+apkPDF 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 10200 bytes
SHA-256: f32b52e8ba5653f92b58bed61e56846fe7574698abeadafea23ea87945574a88
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 17176 bytes
SHA-256: 7d8cfe68795b63518496f9bb146b93a48bfd907873fdd1ca932d80338d85b263