Malicious PDF — malware analysis report

Static analysis result for SHA-256 4074240c23947dc6…

MALICIOUS

PDF

110.1 KB Created: 2021-07-02 21:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 249f4c35ef23e5a12123d68bd2f48696 SHA-1: d34f0553c54d2dc4cd8c2cdf5169ac2fd94ed711 SHA-256: 4074240c23947dc6227028b0581d2860938d95d1cc621394651c16dac1d9470f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6d3195d81e533eeb9f5108da9045eb09/rumirilamobax.pdf
    • http://elite-nails.pl/Upload/file/13077697383.pdf
    • http://banhangcongnghe.com/upload/FCK/file/fogeraxodiwuwalisodetido.pdf
    • http://liffeyartefacts.com/fckimagefile/file/wazujez.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/204fda7526a8fb604c3e7e22ae294977/1799430315.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vfgkh4btsf971iklb81k5pcnn5/dodiredebaxanuta.pdf
    • http://nwatchonline.net/userfiles/file/sotaziwex.pdf
    • http://chiengthai.com/file_media/file_image/file/bitogazuxufe.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5b53fd006bcaff9a48fcb7776d6f475e/91352007813.pdf
    • https://hse.tw/upload/file/95252432395.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6fa512af9b839ca42b5b0305a66e6ce4/resasoxeruxilekojefeb.pdf
    • http://poslovniimenik.net/firme_data/files/28315165275.pdf
    • http://igorodstore.ru/files/userfiles/files/wuxagug.pdf
    • http://www.srijonihealinghome.com/fckimages/file/58349535374.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/370cf2602eddbfa6e1405c81235e4426/4060801017.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/80a21998784b4d36b4caf1f8497ae8f1/10551976957.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9832df2df905391fce93cf8ef71f7a9d/25890554486.pdf
    • http://sola-brothers.com/userfiles/file/17082365264.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b13146c6---latiruwex.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/444e075513f88aada6f9c2c5e015f5b1/funilufa.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092345fe81eb---jexejixazeletebexamavex.pdf
    • http://chatfieldfarms101.com/userimages/53119298016.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/eb1caaf0d055b1cff66c75e20943687a/58801071862.pdf
    • https://2acontractor.it/images/file/bodabogixinuxisosisojus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=signs+of+coma
    • 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_off000149d8.bin
5ddcde2ae551709849e2cba470f4b3a456a10104b8762001ddc1e9ca4ed528f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D8 18912 bytes
font_01_sfnt_off00017be1.bin
dbe60a00459d658a58b3c79f19dbab0eda6fa6944dd70fe9398638cd909e0fd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE1 10380 bytes
font_02_sfnt_off00019352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19352 16792 bytes