Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb2d8841394e64b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 00:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 500614905475d3735c843be4722df147 SHA-1: 98282153f136ec0a94825467f4c0e068a3e6022e SHA-256: bcb2d8841394e64bac4481d8ed67c7b591dd59ef672bd5592be97e0e6ffa2fa1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common lure for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a technique used to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure suggests a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613639a57bc08---32988818614.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/89165431640.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/14557390912.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/13540183201.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/momijud.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/umcu665g2umlh236iir3hg8hhf/26535659188.pdfIn PDF document text
    • http://soles2walk.com/data/file/99613737680.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/17195232066.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wonaba.pdfIn PDF document text
    • http://zubrcup.by/files/files/90928867138.pdfIn PDF document text
    • https://masukpt1.com/contents/files/21196996579.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/36322853163.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/vupikulorexutador.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/betozoresikedafeveg.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/8742454752.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9hgau66omcjskodl4r0rrvtfm3/sebotigurarodefowav.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/ledogasevoxova.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/zozunelulonuwodere.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/20156592772.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/42766463308.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/38781026514.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/40906510025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+play+munchkinPDF 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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 17728 bytes
SHA-256: 0b1c12e8efe0824df69b5e2c6551268241fa12fc59fcd93a9e354fd2348a0810
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 10620 bytes
SHA-256: 59a7c36197002477442611aa685d213d81e6c64172c11d2a15b751d10697c20c

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