Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9ec2a494b9e457…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 21:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bce5314ef6f0e7503ee68a5e98ba52ab SHA-1: 84ca0a5636fc694384f7bfcce5bab9dd62d1d7c4 SHA-256: 4c9ec2a494b9e45712a85ad0a6b4a0403cac6525f4fa6bdd5156bcfa269c9e98
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=free+country+line+dancing+lessons+near+me PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345f28f3b3b---molusudevatupusome.pdfIn PDF document text
    • https://chp-travel.ir/data/file/2671807441.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g509g2nabsq9gpqmiesqo3svh1/80589670818.pdfIn PDF document text
    • https://campermagazine.tv/public/file/novomelidefanume.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/widaruzof.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/lilafate.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/moniweragowoderul.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/wivisegobaliponojumovim.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/39689741579.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/80490543158.pdfIn PDF document text
    • https://kawanmto.org/contents/files/benefemozof.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/57799299009.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/25591597679.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/62248103794.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/wetuzif.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81568c9a7---70367505867.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jitinewisa.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/69625575671.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39393319494.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/99121855172.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/23697480943.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133536a51301---83006181722.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/65861839937.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/67288370867.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/34544779401.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/306405693.pdfIn PDF document text
    • 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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 18712 bytes
SHA-256: b89aa6703a683b311f703d4006e399c89d6617b5d8b29621cd9c20f20639617d
font_02_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 10904 bytes
SHA-256: 32ab87cdf76725d43e696da4d0b63b5ef60f435713b1df1f1af798248ed939bf

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