Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8535400b93b4b7b…

MALICIOUS

PDF

98.4 KB Created: 2021-06-28 18:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 168062a198892cf857836d5ccc913bdd SHA-1: c89a0ca51d1e8d5f4bfdd38a56281a9aac055083 SHA-256: b8535400b93b4b7b08ee4e40e62a98c30eda5b54f48ea101c10f75dbdbb8ac44
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malware or phishing content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an effort to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf962630e59---38087176616.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a43bd14f433eaac9b884f12580f9876b/gadexixa.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oocjfnm982f9bh3q1krjrg24g9/62977069485.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/061083a5a0ad1c27763949d53a2f926b/nojafebezomorupu.pdf
    • http://challendor.com/fckeditor/upload/file/kupadubuzepebisifaf.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qttidsdes6iri6lkul3livtll6/97634441616.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kurr24671t4pmjk22cpgp8cark/30149886734.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sd01r5ckm0eg0ojdf1fds88afd/2211284800.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949860aa8f6---62017076710.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/kazubozilibedosamevilebum.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f0201554---41867160803.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/456dc4e24eaca958dc9d73041d368d78/17265719096.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac583cb2e---wawut.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea3d8ddb5811e2cb1d587132a7b597b5/lerep.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bba3844d---lizusevokazosa.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082918dd3206---duvosanojokat.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/duf12nmlernimovdq9bp5l1o9m/sepefekaropujazavoni.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d72c150b---77871098352.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/35153ce847975db79f0d7c4cba4c1521/nuzasavirulujuwimir.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/1df1816e91c61f5de459278a8b6ecd3c/55574231101.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6884f138bb---ramesepilobikipona.pdf
    • https://allmassage.net/upload/file/20210510024611.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/10336252884.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/kerixilesojusizigufozesox.pdf
    • https://ladangmimpi.com/contents//files/825955769.pdf
    • http://beerskiboot.com/img/upload/file/55509170069.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sherlock+holmes+serie+moriarty
    • 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_off00011d48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
font_01_sfnt_off0001355f.bin
18ccb0ce29c54ea925a5f3a1c574649472bdc4dd3b1b12e5838858a42ff6cd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 10672 bytes
font_02_sfnt_off00014de3.bin
1e037b2de96f960788ba24bf383d5c2cef4cbd18c66f805f5b4e64a46d1bb41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE3 17452 bytes

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