Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d789c0581b31671…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 07:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b83972559047aa156e2f025f8f165bb SHA-1: 14b43d54a0d4b13c7fe62af1ab492820a367c7c3 SHA-256: 5d789c0581b316713105f9b409361fd35029052606b461cec847c387f553095d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised websites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or payload delivery. The link farm, combined with the ClamAV detection and ML classifier flagging, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://palaciodelosnavas.com/userfiles/file/xebetim.pdf
    • http://www.almansori-ye.com/almansorifiles/files/57834764970.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/zefopofiwepokavenedej.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/21e52f3d31910f33894a708124db2520/34572977647.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/75613713981.pdf
    • http://kemmurad.com/webroot/img/files/37517542932.pdf
    • http://mdsalon.ru/img/lib/file/99399634116.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ceed2504a16b27cf39e6b882e5e709b2/fuxus.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/nibed.pdf
    • https://ktmcollege.org/public_html/userfiles/file/zesujosiz.pdf
    • http://konberdbio.com/upload/files/nunidebaja.pdf
    • http://artwatch.ru/userfiles/file/mapedipovabimimezuxapeba.pdf
    • http://labradory.pl/file/xiresakinijapoxeriki.pdf
    • http://elesi.eu/fichiers/files/92210607330.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/9904412208.pdf
    • http://sten.kr/club/data/userfiles/file/20210904091844.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161400a64a28e4---95834085521.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/54628645384.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d586e2e803---95622345241.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a867abfe31---83665683896.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/vometinukatubo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+dr+driving+2+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 16792 bytes
font_01_sfnt_off0000d376.bin
a3078c1721254804f3ffbb303201f1c8b1ddc2c63954fcfe6e712bd2866122ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 10700 bytes
font_02_sfnt_off0000ebca.bin
116d6a609e869e1c7f76e7e4fcab74dcf1cf673f1a60d8dd265461f1ad2c0dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 19820 bytes