Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e6415c8693bb93…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 01:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8c16139b5369e35b727d0313d32e44a SHA-1: f98e377d6def960d5be67ee42665df7c7064ab54 SHA-256: 18e6415c8693bb939f5bf9b5fa2a949a490c76644f308ff9d5e1bb0a4a9e47d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://luyenthitoeic.info/userfiles/file/fewamubifakatupisebixeruv.pdf In PDF document text
    • https://rsebolivia.org/userfiles/file/satosozubibaf.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075f595cc161---naxalosuvodujasifaxodex.pdfIn PDF document text
    • http://roocenter.ru/upload/file/92301874462.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/74279061429.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vewujebowuzobemogamatixim.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/nanuzepiwoxogunesuna.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/28570971109.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca770674f8---74552661126.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161246144c793d---duvotitigowaranorogev.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/27113735513.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/225172eb2a10d2e9a52f34d2e378f34f/figepujoxoxijuzaxetatotan.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tdpmi20s7sjjrs8c59i8fu9ag6/pifikulizowedofetukepido.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/37023227521.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/54777803966.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/burizikuvifub.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121665fdca0c---56180074868.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021072710193973499.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a343167fd85---1277090200.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097636f982b3---9185576754.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8316c348ee---zagakujimazifamapemobig.pdfIn PDF document text
    • https://rajaunited.com/contents//files/13404254543.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0806651001625151256.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6eadef771ba783c66e930070d120221d/xelonefitefiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=odds+on+man+utd+to+win+the+leaguePDF 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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10804 bytes
SHA-256: ad514cbcddc45c315e592cd3dd6ab2bb2f3bad333e5ef893ee17bef6ace63672
font_02_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 18924 bytes
SHA-256: 8c08e886b0466dd708e809220622631fb593b141ba58c8b2ea846b690dc1653f