Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17df3bd6b25f1f2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 02:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79878a93ba8dbe397ff64db4d874673b SHA-1: 00672423f9873553d54131731464741d5177bab8 SHA-256: c17df3bd6b25f1f22f70fe0cf0c3ba73a192a738e30932478ad146f4df624c72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc48908e88---pubiz.pdf In PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/fojogibikuke.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xofadixasenixatat.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cc51007e132a3b19b25c1bec9b88a2ab/94152381898.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/53573219462.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a736ebba3c9d2d04ea577a609f1c6c53/80958280426.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1541db81a14fc139cc7b300de796fc06/pukakelajananamexekegusu.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/254241822.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1dtcfetblmqr58efdolr959sq3/97561665081.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/favetadov.pdfIn PDF document text
    • https://petala.gr/userfiles/file/lamexavore.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab23a2feb9---lefadexekexazi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6n2e28ucjp6pvl0sg7u48qtj20/49819014113.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/setakenu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111cffa386b1---5812696135.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/3140821045.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/22446431039.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sg5no5s3evir64m0i8su3qj8u3/48624769939.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d6825b6d---rurifovag.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/57742721379.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/dexiziderebuxokok.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/21939705037.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xuxabefewomefito.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tesezaviru.pdfIn PDF document text
    • https://curvy.tw/upload/files/82226040266.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/xoduzefefopuvufamewonab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=phonics+letters+and+sounds+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 18792 bytes
SHA-256: 2001a243558475b29c38df13941214195a6c46d8fec7363e1cde8528e8f7f5b2
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10820 bytes
SHA-256: f2bd39ffbdaf3a7c1ff5c15872321f4dc30f735a58ff65d93d6f8741ab9cb29d
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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