Malicious PDF — malware analysis report

Static analysis result for SHA-256 98750e64f10950d7…

MALICIOUS

PDF

88.7 KB Created: 2021-06-19 23:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 555f24f61c92d15eebbcc2c32514c06b SHA-1: fcc267f8f3058824f748824880a0f2168ed1f3c4 SHA-256: 98750e64f10950d79898d37a4f7848f04727f76c9699878a338ae01c056a7ca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which appear to be compromised CMS upload directories, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to leverage disposable hosting for link distribution. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://247hvac.ca/fabulous1/uploads/files/kozana.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ce311d13---81677158829.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a31db7cefb5---13944205536.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3119c0dee272e159780d62c92be5903b/82111723423.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/18491125888.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/9038137915.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4689258718180dc5b255825bc10bb936/jejalerisuduwu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2b02f2034a7309bb9b20253a170a179f/19747794577.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa397084ad---xijugodabon.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5596fe01---69853177673.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ac29c65d---67694204469.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/odlknknhh2gq67g4vgkl3sc1et/34813556454.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_014724.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/vebawobad.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/sipitizilenizesefiwofulak.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/715e275a75cc99da3e6a6d0c87c218c5/45014295130.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/43cbc7c9de7a07277b7b4295901b2eef/88593736785.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608347d7bc6ae---viwenomezazijagimimaku.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c98cc22f4---35647194424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+do+a+backflip+for+beginners+at+home+by+yourselfPDF 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://scripts.sil.org/OFLIn 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_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 5928 bytes
SHA-256: 5407b203d104a974c5e425f294b50d9a618ba970c0c36b7d45ce59789209f8b0
font_01_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 11904 bytes
SHA-256: 283fd83713dc47d17d7f88f3edd1d237c04afc6a4a8f6cda80c4e99aa9470988
font_02_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 18272 bytes
SHA-256: 198764c9ef5087fba1c59c1c9c6f944d74851d5e2b27eae2ee8fbd00a8614c15