Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b99ad3fe1c022be…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 20:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68f362f324c8992432e0378925e7ea45 SHA-1: aa10f540db44ff2bebb8e8621aac36fc6b99cbea SHA-256: 6b99ad3fe1c022beb74144d7ffee85d1472c5a880a170fbc3c46d727c42de331
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests it is designed to redirect users to malicious content or download further malware. The URLs extracted indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=my+secret+romance+full+episode+in+eng+sub
    • http://jjmcp.jp/userfiles/Image/file/visupewa.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf5288f04---xifobopap.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd62daadc0---taragezawe.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b867e72d173---letijik.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0ea86dcb3cdb8dbf08ae2390d99ab0d3/98441656632.pdf
    • http://seanmore.com/userData/board/file/151933487.pdf
    • https://bcbc3399.com/upload/files/zagofa.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ce4e3b42---tilemuxunalo.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a1b1c5fc---56817277003.pdf
    • http://szao-spb.ru/images/news/file/17618880141.pdf
    • http://www.lnk-creation.fr/upload/file/36601248645.pdf
    • https://promise-land.com/upload/file/kuvamuwesuzuduzel.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/muririt.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d24763e2---72940049449.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vfpagtboku8gl215fphnin2267/viwemurimefetu.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fe3812df---62437397516.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/71779e82dcbffc1a59c0df62b64cbcd0/32514412797.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ip9hsmlejsqkdeg4l4u7tknavo/7071806789.pdf
    • http://volvo-cars.jp/js/upload/files/peselixifobulumod.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/44a4d339cbf7ff1b29a9723823be68ec/zitijiparugikaki.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b153d6543---pegomabasegufigosekob.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ff9084f---gilusepufebodi.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9023d5ed2001d0b0e68bca2abca873ca/34237818485.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_off0000da23.bin
68699e9ea172ed0104a769274a116601984a2df5cb120cf5f7478ff6da0b963f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 1924 bytes
font_01_sfnt_off0000e31c.bin
55701ddca5f54401e971e45a17d680570b5456684048efe5a6ba7d6261b5296a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 18040 bytes
font_02_sfnt_off000111ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 16792 bytes
font_03_sfnt_off00012a16.bin
1e4ce2c5797d30014e20e3cf70c7107c56482633e68a9b76fb045fbb732daf72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 11308 bytes

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