Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8413a7d2a574bfd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 23:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00e55c70a56ea0f16e3eb5cd05619954 SHA-1: caa026a37256be758fabc5fb4258b2b9f94bd8d1 SHA-256: e8413a7d2a574bfd296f9376a13eb4e79188a30995402f8d5ba91bae656ffdcf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agataklimowska.pl/userfiles/file/xosivi.pdf In PDF document text
    • http://lyzjkgm.com/d/files/wevuzenipawegaraxifiz.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/43969097789.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12e306581b7635bcb3952b3e99ce689a/22869164804.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316473a109d---77471119492.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/64233322056.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/42902517057.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/budixinud.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/padagatiri.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bidurobusema.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/24188076003.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/1983226948.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/miboka.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210904_9EC03686E1B69DC9.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gawam.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/vokopodexixavedax.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tulafisiz.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903134348.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/26878137930.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/68706355973.pdfIn PDF document text
    • https://manenshop.com/upload/files/futizulibedaxipax.pdfIn PDF document text
    • https://kimcert.com/E/file/rudapubosiwexilep.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613904b498af7---69373521648.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/sajepimowadu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/30132883100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lego+city+game+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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 16916 bytes
SHA-256: ade678af38db18c7c89a83a6d77012acd9d87d8a758bd7e9aa007c369ccab625
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 10568 bytes
SHA-256: 451d067ad45b40cd1f48f636b4646fdfebaadef50e910f120bed064596e13f8a