Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bb15b313a9cfa1…

MALICIOUS

PDF

88.4 KB Created: 2021-07-04 18:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 200145af9a6d58d650b7e81a8fdf3fec SHA-1: 72d34dc8ca0a27a3f148f9dd2d85d8d078f57701 SHA-256: c9bb15b313a9cfa167a13da9e09dad1dcf2a7e9c6f252f0817b28cf1e1d123cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=armour+piercing+9mm
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a803c22871---17793523397.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/adb2d0e44faf6b3c2d4f8f983af18538/doxunus.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52685d70fc---nenigusaluponupiw.pdf
    • http://orderkai.com/uploads/files/69943422613.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce8a1bae5---ligaluruzumagupimidegif.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b5822d33---gesexivadewufabe.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952f8c9e54---nakiradew.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1360879c9---futuwip.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608067b122b52---86111758838.pdf
    • https://parfumzone.ro/files/file/boxidasu.pdf
    • https://sasalidayanisma.org/uploads/file/woteviwamovupuluvogujopud.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2f0e8eb9ac125a4e8a4fdd905289b752/zimubupowew.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8dcdf972---pubutirutubewoxi.pdf
    • http://makinsushi.com/uploads/files/bomusuxikajuvovur.pdf
    • https://aawyx.com/sites/default/imageuser/file/pudexivokinulatabesa.pdf
    • http://atomleasing.ru/media/File/87165763830.pdf
    • http://starke.ca/clients/84205/File/59524702982.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1c7e01ac5dad53c3d581ab9bba1873d2/vuwepepozalalimenanetodos.pdf
    • https://amd-export.com/site/upload/file/sejufuzafen.pdf
    • https://yuss.it/file/99601426209.pdf
    • http://asea-admin.com/_userfiles/file/20210621043649.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160777eeadf8fd---berid.pdf
    • http://goodslib.com/userfiles/files/27754654685.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c630e018---butimexejibuxifelezazuju.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_off0000f652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16792 bytes
font_01_sfnt_off00010e64.bin
974baf0496a74029217f3364749f3895e5fb814569b07d481448d57a07fd3f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 17736 bytes
font_02_sfnt_off00013d0e.bin
8208b97a212e47800002ff1244294303a3c63c50cc5577a19f4fcbd5a56992a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0E 10492 bytes