Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edf254531b97bd8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 03:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9272bccd6837fd149912ee071aaedbc0 SHA-1: 44dffd76aa1e735ff1db84a4dc41166826dcf663 SHA-256: 6edf254531b97bd8e7fe249d8b72d6cfe6bfd1c4c937bd2cf91dfde9b5ceb0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to URLs hosted on compromised CMS platforms or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://cnhhgj.com/upfiles/userfiles/file/ruvesike.pdf In PDF document text
    • http://lovesenergy.com/file/noxuzaxiwozison.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613777f718ccd---pugumusalaluba.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/77138300279.pdfIn PDF document text
    • http://adice-area.com/pictures/files/92784050890.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/80333051198.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/pudaloxusizoji.pdfIn PDF document text
    • http://maksimetall.ru/files/62349560479.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/basadolokumuwumesade.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/59659724110.pdfIn PDF document text
    • http://hangquangauto.com/files/87939173116.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/14441136918.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tanodavinavaxaxonudurute.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/3374425840.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/36498514789.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogilomekixopupajigenoj.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/88530424426.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/98408913285.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7439k3br1lmo8mjqer52c6ftsl/38856870330.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/togitifipuf.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/71739170134.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/ridekapevodibisisuwukofig.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/55669034004.pdfIn PDF document text
    • https://parfumzone.ro/files/file/74368475857.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/bonijuzumotodibenanibovan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=photo+grid+maker+for+pc+free+downloadPDF 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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 17324 bytes
SHA-256: adbe4f4f0d862221ec1e690c76f4abe85ccd31b715fd307b2a378ca486cfad78
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 11080 bytes
SHA-256: 30114992d90090d6bf7158c7efad0f96779ad557d971b5234706d838c4580030

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