Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dfd2530d7100c0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 16:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ac56f53bfc7eded56b75dcc4204f4de SHA-1: f3f510772b3bd517e81f5d9d06be65c256a12ff4 SHA-256: c6dfd2530d7100c0609a7d23e9e689cc4bca3affaaef8507684cbc6cc093df36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript further supports its malicious intent, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://humidorio.de/ckfinder/userfiles/files/wopowu.pdf In PDF document text
    • http://pitchdecor-construction.com/user_img/files/xurujekijodolut.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614949de9113f---72681318043.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/74292887105.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/53675093095.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/beleralewugegakowevegev.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/26805518628.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1to34q1fafgra9a73dsic5vg81/19312292170.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/powolumaliwugutixit.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lekubi.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/xexavorujuva.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/1586697774.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/tideburapozami.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/45962677953.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/51591974561.pdfIn PDF document text
    • http://smartcirclegroup.com/userfiles/file/nuwuwabexumafa.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/7493792249.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/90327716812.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/29406389204.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131506a3e469---jojiboteriwobideruwu.pdfIn PDF document text
    • http://rapet.hu/files/wujazafupajuzixabojerile.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/95162164397.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mulorolunojeguk.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/zefikogupidaxupatibegesal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+put+a+picture+on+your+home+screen+for+androidPDF 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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 17484 bytes
SHA-256: 32ba0e71013415cca1fb1ecffd19900835bf537c3417a7346114ff79fb7b3f1d
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 11132 bytes
SHA-256: 2711c88011954ab53814af76172a9a56e4c96e24b98788e1a461688f840c4b1d
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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