Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17f61604c91f71f…

MALICIOUS

PDF

99.4 KB Created: 2021-06-29 08:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 619be819eb3264cbdd0d668a5270dbf5 SHA-1: d6f6ee26fbfb4de4e2e2fa4651b4e7c779516c11 SHA-256: d17f61604c91f71fe65f6e670be49973afec1d6a398430eb7fd02a15b5e97326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic firings point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://archism.ru/uplcv?utm_term=meaning+of+the+tabernacle
    • http://www.celso.org/download/sikajopanoxigenil.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8b86628ab28cb15068e8f62049fe00d/96394663933.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088851af2a03---zapafasuwazibuginigowixap.pdf
    • http://gapoom.com/upload/fckeditor/file/71523847122.pdf
    • http://bettaletroom.com/file_media/file_image/file/figixenanub.pdf
    • http://topas.lt/userfiles/file/87000930696.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/npsnrfg8tm7nk1hm3l0nolublh/16439190540.pdf
    • http://notariocprietoa.com/notaria/documentos/files/verob.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/15f6648fc62eb170361044410c8d9b63/67796652322.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c780f917f13---saxunavamizikaxemo.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4f0e6d6a---96222513982.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a745435d7---betiwilofef.pdf
    • http://gorisum.net/fckeditor/upload_file/file/36328521374.pdf
    • https://thefencedocumentary.com/adminfiles/file/16933012683.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160adec03590a9---rixarejepukes.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b5984bba3827bb7a7456894c4f6f8936/lobekexuwif.pdf
    • http://augustaelectricalwork.com/editorData/file/rabekoturalosedeseb.pdf
    • http://scandirent-new.ru/uploads/assets/file/32086735878.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dq6c9k6eium0gksvj6jidfkvb0/jolesebiwop.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29e7c2dbf---xuwisoji.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/19982ac06a6017ea79c9451b2d7512e0/pujeredumotenazupaxi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cfc6a20e9---9454924776.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160757d0b7a9df---42754092777.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8a4b344fd---26862337952.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e0.bin
1bb16cddc45b456f53f1aec0290b41b4f1197e9b63d7058b8731e629abbc9fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 20564 bytes
font_01_sfnt_off000133d1.bin
33d2f4d04d15669e353b2ee61ee12f4e8ee1dcadb3fa94170f3c59b95017ab40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 17892 bytes
font_02_sfnt_off00014fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBE 16792 bytes
font_03_sfnt_off000167d5.bin
e34a2d656e0f2a388c2d7ca46ab052c5dee25ea21ddda3fc142c0a09149ca5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167D5 10580 bytes

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