Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2b2803490cc2b1…

MALICIOUS

PDF

105.5 KB Created: 2021-09-18 17:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 540b262adb1a43a6908e2d549c1183b1 SHA-1: 807a74627419a38a66d01d58aaf8b035735bdd51 SHA-256: cd2b2803490cc2b15570132df438624bb4a64e3001d1d917765b0307e87cd44d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=pokemon+sacred+gold+randomizer PDF link annotation
    • http://tianlanip.com/filespath/files/20210910065455.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jinino.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/sakiripibisurirawusevi.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/64219774243.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/jakenul.pdfIn PDF document text
    • http://livestocktool.com/d/files/29227291106.pdfIn PDF document text
    • http://generoussecurity.com/uploads/27281236084.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4619f7649d1db33e4fb4c263729c0153/7955922239.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614571bd95de4---fapewadejulelajomavozaf.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/80373022626.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/wulavad.pdfIn PDF document text
    • http://datcat.vn/2018/file/winixukudozanuwutilalaku.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/59325815273.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/75442990313.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kagis.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dd4b3de9---bonarapo.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/puxezokoguzegipa.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0459c375415d402445fe3d00d0bb531/lutexupapotoxitewojezosig.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/400dd375c12ceb3c166cbcd3790f5c11.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/34038384389.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090516258874.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/sudusanugirosarotinoj.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_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 18652 bytes
SHA-256: ca53b3602cff7f36c6e79e0ea0c85c69424126d8d2494b8ad41e6af5ee57e51e
font_02_sfnt_off00017fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC6 10768 bytes
SHA-256: 039584a7015f183ec17294a818bfe4820fff659637668ac0d8a20ac6eee3e8dd

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