Malicious PDF — malware analysis report

Static analysis result for SHA-256 b854c2df33ecbdf0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 09:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9beba781f3a2c055de99d037ef9c755 SHA-1: 6d7be0d86b8566c39a2f1fafe99348d4ac572420 SHA-256: b854c2df33ecbdf0d3d4cf246fd27865e7e63aaa9acb1b9a3153549c804682a1
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or redirects the user to malicious sites, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=how+to+view+stored+wifi+password+on+android PDF link annotation
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/73519031772.pdfIn PDF document text
    • http://friulanapanini.com/images/file/59317787301.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/21506693262.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/34684138726.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/5575846844.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/12085976592.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/rowalifimedubajovanifezu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wejisolamavax.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/bezamubam.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/xonana.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/49144792096.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/34598685369.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/dukimezowi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463aa4bbdc5---tiwukubilefa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m3tkgfql0hemm5qh79jka387ne/82874387654.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/20820023568.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/25749625401.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614692a7a72f8---48305068114.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/vonadijitakufiwamejo.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/tikevexuvogobiveganazale.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7b9d23646dbf4fe15b7ebaa02bfe61ba/tiwizepisosavutem.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/69601707629.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/2203548821.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/ribonusegeme.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/salivoguf.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2fef16c84f92c09e27081612d634bb6a/91489401247.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_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 17816 bytes
SHA-256: bdebe7513bfd287e963bb360d843b91c369d07ebb93bace951edd71b9df53f57
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 10588 bytes
SHA-256: d9c334900be47d85abfee453865ba63254a8b8016f947726928d5afe2cae8194

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