Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41357aec24639f0…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 05:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b941cf668ac2bf9c096c242f627fc2cb SHA-1: a0850019c861c6204a37504920a82d8fe5cc4775 SHA-256: e41357aec24639f0191b6b7131c5272ff61450a1030ef34635299db4609f1fe4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080c68dd3a61---48810053326.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160806ada7625b---7274803822.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f1694dec---44290822176.pdf
    • https://nanosoft.mn/images/content/File/21582029100.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb5992131c---mipudesudaf.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2d0965f429cfd672e2f43d2bf85ce5ae/18648876167.pdf
    • http://kovacsoltvaskerites.hu/images/file/74761788591.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387357fe37---dovur.pdf
    • http://onishi-kyosendo.jp/archive/lotoxul.pdf
    • https://vibanghanoi.com/uploads/files/dogatidikedo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44609cc2d9---kiwosofirazofipo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/540ead056235b438ffa4aa91e0bbbab4/25199290255.pdf
    • https://ahreco.com/uploads/news_file/96068869402.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/839ec10298cdf2b832d233725c9d0e22/6713225262.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b12f1eb81ea0602210ffdaf8a560d963/62246841803.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa6dcd6a3---tonudarolilekufinagudet.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/waxuxudawuxabe.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609405dc16032---gopodeludugodonub.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/504b44766d552aa89cf417c3b753860c/78198091924.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d545950140---zuwodiminam.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5d37784435d784b1c79bea01dd7b8d2b/45046098470.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jvn5hcsl5fjllqdhjo5t9ok67e/22986448625.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/319ee6ecf0a6e0eb0891e246cbb589fb/votudarekipoli.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee6d35a1a---69352939436.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9end5tuobor63pdoueakek58ps/wisetutuk.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/lavutuxidokikisi.pdf
    • http://alexandercdg.com/clients/36029/File/lavunoxobazijezak.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9642a0202e---zilusupotoresodopiku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=girl+names+starting+with+aj
    • 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_off0000f8fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16792 bytes
font_01_sfnt_off00011113.bin
7a408a8f554441039b15b61f61fece87ed904f0c0f952d8ddce858cc6752f0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10692 bytes
font_02_sfnt_off00012965.bin
ba792014736b9b87aac324dacc5f95d58ed04ab059cab4d594fc746ac79785a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 17344 bytes

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