Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1402b7f8190cf3e…

MALICIOUS

PDF

105.2 KB Created: 2021-06-29 02:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79eb647c580a13adb6602d4e73568f85 SHA-1: 247e9a176ab8d89dc206309c598c0d4dbd60cc51 SHA-256: b1402b7f8190cf3e09c56aa0df7696fbb086c02b23ffd4d3a9446f6b5cb2becb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://garglob.ru/uplcv?utm_term=existence+meaning+in+bengali
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607262e2a1396---82783260487.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083d888ca2d4---62433103270.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rck56lj70ofad19kukhjv6s6p3/42098851044.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160baceac6ed62---kopopaturoribuzozosafisiz.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087625247b9e---potizapinazasajiri.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0859cfd34ad744b0cd7806f32676348a/83934991478.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/833e1df472c1f29d4c14980c7575249d/12648903843.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beccf1a6525---44686020414.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/98825288394.pdf
    • http://ketoanantamhcm.com/uploads/files/45807401438.pdf
    • https://adepotcustom.com/UploadFiles/file/20210502025908107.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/dizewunedizawimutedol.pdf
    • http://artecgroupservices.com/imagenes/file/62960828199.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b83a89850---nejazexowobuteruvad.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f468fd05be689b3a022d81fa5e82009/56723884863.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6834b3872---zadom.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/68a37835fe8ec81a01142c730d34f97c/sorukivok.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acf0d4222---63172939914.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/rttekmifvtkmkpam1uvku5ufr2/lazaxup.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd25c48b4---33849561222.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5979cf5cafabe70482424ea3604f676f/gusenutuwusiniri.pdf
    • https://24emk.ru/ckfinder/userfiles/files/nesalizajejivafuvi.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/24275056632.pdf
    • 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_off00013b24.bin
ca32f7b1d644a51cdd9dc35159dc01395f5fc98b111c8375486aa9a7db788c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 16176 bytes
font_01_sfnt_off00016522.bin
d5569cd67d27fd686f8c5644d59ee22a5f67d6abb937d13d1b96af47e060decf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16522 10576 bytes
font_02_sfnt_off00017d49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D49 16792 bytes

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