Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5803de1362a9f4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 12:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92ecfeddbef3522b144ce04c5c63b901 SHA-1: 35c5f293ffa8affcf9a84ead724affa2838ba1d9 SHA-256: ec5803de1362a9f4e94c157ce6e88a8147db48d586bcdaf7b39eeb5b594684ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by luring users to these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439d21447b---48517000967.pdf In PDF document text
    • https://hbfilm.ca/resimler/files/30154518345.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jge2qertsor7eldekrn4sdjun5/82335310276.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/84444600751.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/10285750684.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/92480370479.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/30213725885.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/57637673666.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/wewamelawudifafe.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6d52d75a91e718c325a0d62606f090cc/dojarawesuriposuginokex.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/lubulavogujavunolekerusum.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5a79da88473e93e79c658a6f7870f4b0/76133014308.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/36493257101.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/pemugewenizozepemojipipa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gawuwulapuguwix.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/29972944947.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/keregit.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/darifumajo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/97154630260.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sedaninekupabulim.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/97317962794.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/11323658185.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/ratufojotesotaxoliwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+pubg+mobile+apk+and+obb+filePDF 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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 10896 bytes
SHA-256: debc1ef32ed7fdaa87e5ec01e7498682be8d8303fae7979522ac65f6b6b91301
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 21432 bytes
SHA-256: 6b532323517a18363879185e07dbfb19b64fcbc4e9d2a60c0a9192e6ce1003f9

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