Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0df6b49c7ffb5d9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 18:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f924a98c01d5e1d49488fe7eb0799264 SHA-1: 220a60f84dad10b749c670fa472635ad497192c6 SHA-256: c0df6b49c7ffb5d927deba0e8d418d49d0ea015d8e275c504622698fe81861e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS upload storage suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=draw+it+mod+apk+vip PDF link annotation
    • http://librojuridico.com/aym_images/files/vozutanu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/majezez.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/jonimom.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/bememivivikobugobigopab.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/60773262399.pdfIn PDF document text
    • http://atrsara.ir/resource/files/46910784418.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904010330444020.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/69d0855890235c9cae0087f2c20679a0/79797745981.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/7779852779.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/liwazeposemojenexalo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded5500478---41836109496.pdfIn PDF document text
    • https://digireg.lu/upload/32884808368.pdfIn PDF document text
    • http://szallas-karpatalja.hu/upload/guxonevuromebodesanone.pdfIn PDF document text
    • http://cloverdiamond.com/file/lefogugujokorilo.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/82474743860.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/79226817212.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/toribejif.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/pujep.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/nulinufidazujinovitebelu.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/41272905960.pdfIn PDF document text
    • http://www.toptehnik.si/images/jibipiwaguniwutato.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0586a75c1---86317080177.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b94d7e206---fuveritonogit.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/22824607387.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_off0000c71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71D 18768 bytes
SHA-256: 8a6dea81837942e48d1b8b31918917b37079b34c6f14356e250138e3f03cbb5b
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10348 bytes
SHA-256: b4ee61eda76a561a4ef9d2dd8931e6d8e677bf5616267a6a72e02a8b32de0f44
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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