Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fd227db79686ab…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 07:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54ec78eea1bca6d61b32176f7228098f SHA-1: 5d19074a4c16f14163a5c28f682b38d7467e8792 SHA-256: 10fd227db79686abf484b9217255749e2885dc2ce11da10ceb832f17431d9808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic to various destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://globalone-mould.com/gbw/fckfiles/20210907042150.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/63423923191.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/kugaworofib.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/33573685763.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/talufogepiruv.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451f307f96d---sizegelam.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/94530182444.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0b8aabbe---89402152802.pdfIn PDF document text
    • http://mimpiindah168.com/contents/files/duwibe.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/91046024349.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/23069240798.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/finorafabaxidivetof.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/159300668861440b4d217ef.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/tanaveduxidodatuzi.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/memito.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/tapevikifinifutup.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a239522912---titurasuxak.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/45303055823.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/18473198693.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/55142681308.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/poposiki.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q1i718ui062lkt9djhl2i5us2s/nokokidudodetuvixa.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zimanipisuzewinetad.pdfIn PDF document text
    • https://menu2uplus.com/images/file/56243762461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wwe+wrestling+revolution+3d+mod+2k20PDF 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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 11180 bytes
SHA-256: ec72ea81983fbb1bba779c645aac9625c13d6fb6de51230a486dcf1a4aa34f4e
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 19540 bytes
SHA-256: d01e258706ead31862f787344fa99e688458979ffb4d8ffe12422ea7b5d74dc1

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