Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7862b7598a54ef…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f361f825f3234d0553a57956bec0b70c SHA-1: d3eea23232bd41f6beb0e339f577d2c77fa7afe6 SHA-256: 7c7862b7598a54ef17f44d7ee98d440b99b05487413a6652df006ced99d5b389
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://energy-labels.nl/userfiles/file/dezeko.pdf In PDF document text
    • https://mycocoa.org/images/upload/files/tusaxu.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/kikivufejuban.pdfIn PDF document text
    • http://medica-brno.com/files/jesofafigezidavisomixaxip.pdfIn PDF document text
    • http://palami.by/images/file/82730232107.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/38399808166.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a3928994---rapefikujubefir.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/56906512070.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/fededase.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/jebomimuwutininixetap.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/17219500242.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/goxozedi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd78532c3---wemakamepewojuf.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/rezekegixadivigam.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/tezalasilukulenuresagu.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/31964369029.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83411783713.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jijevagulexukujanazela.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c72fa67a5a51413c522c2c5b744f78f2/5399490999.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vlocqe207t38uc65v34g5js6m1/kusimegurudimafinot.pdfIn PDF document text
    • http://wixoon.hu/upload/file/11068645374.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631172041_97ef60c635.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20280713987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+open+wma+files+on+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/96118261103.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_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 10736 bytes
SHA-256: 1a718b0852027b610254bfb7087fe3dad84853a91c36304960456233c690e2ac
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 17540 bytes
SHA-256: 76eb4cac348b7a8fbac6676b25436611ef99ceee65013c9648d9462c5e647e95
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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