Malicious PDF — malware analysis report

Static analysis result for SHA-256 497a14a7f4aacc8e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 13:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87d56a7b780f2d4c1f61414a31dccee0 SHA-1: 0431e985112cfc234861f6fdc67a5efb9a57c7a6 SHA-256: 497a14a7f4aacc8ebce20a74d05ba9a741e545f74be790a8bc4a95ecf9062643
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains embedded JavaScript, suggesting an attempt to exploit vulnerabilities or download additional payloads. The PDF also includes numerous links to compromised CMS uploads and disposable hosting, likely part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 http://pujcovnanaradi-tvarozna.cz/userfiles/files/vapenivob.pdf In PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_5D23BA539CA3C7CF.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/balelibomu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/motumegevomarugexuruvo.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/duserilowaj.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/zuwefijoxubupi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/69057839997.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/jotopotosafojak.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210912153610.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/13759493591.pdfIn PDF document text
    • http://wamer.org/userfiles/file/42441253149.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c8eadf66---retulemurixewuxeriwej.pdfIn PDF document text
    • http://change4best.ru/upload/file/vikut.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/nikawakutega.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/47349860863.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd64413e02---51064038721.pdfIn PDF document text
    • https://nistd.in/userfiles/file/fisudiwetesobaxi.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/siveladevuzobo.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/xewajimemudupin.pdfIn PDF document text
    • https://33mobility.net/uploads/files/zamukij.pdfIn PDF document text
    • http://hotechike.com/files/files/23471965226.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/fegamasisowozine.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/14309968221.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cada03b7e2---palezifejuramixon.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lokoviroboxuwovunuxem.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fupuziv.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/61464582842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=skull+island+full+movie+onlinePDF 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_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 18292 bytes
SHA-256: 6d1068dafe9a31305fc28522432ca4441f798898b8136a543d37936d8a889bf8
font_01_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 10652 bytes
SHA-256: d13cf06932ce803e57679eac527fe4be9cb800731638e2adde379421a1aa64d0

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