Malicious PDF — malware analysis report

Static analysis result for SHA-256 409126b7979e3150…

MALICIOUS

PDF

95.1 KB Created: 2021-07-02 02:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2060472b716f5179cdfd6a4acd4d2113 SHA-1: b109d6b3fc63435ed3ac8f7c5004014c57332534 SHA-256: 409126b7979e31505f76647ec79b09972fcec0b682701ad5768fc2d0a828b80b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The presence of compromised WordPress upload URLs suggests a technique to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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://queure.ru/uplcv?utm_term=50+cent+2pac
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32852218d8---2827996618.pdf
    • https://xo-sound.ru/userfiles/file/97073817359.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9cb9cc03---xurajepowisojudotumiwa.pdf
    • https://artasedanasingaraja.com/uploadfck/file/besudumepekatoz.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62d8ea9fe---48333257041.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7ae0c042---vokezase.pdf
    • http://vtaky.sk/media/file/xizakuwopoxebuweboviruzeb.pdf
    • https://et-auditing.com/userfiles/files/84997706162.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e8961932f91b5ef4942e7126f1f1c1a6/44984655103.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608486bb43712---48058591911.pdf
    • http://smartvoicecom.com/userfiles/famoxujejujelakenir.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099baf907947---zigunetalobopiwubarek.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98722780741.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d965bdd1---wilimumupigawobe.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/u9dr1ales317ob9f4jfi21gluh/99485105372.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098210aa4c75---29017108636.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9e90bdce---rasirele.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160848bef47793---63626167717.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/r0dr0u9k75m8t99demaui2195d/97090118384.pdf
    • https://its-bulgaria.bg/files/file/bejetupa.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098af1aef4f6---37059664931.pdf
    • http://metaglas.kr/userData/board/file/vomedubidonik.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/vuwunatutabigurarumubogo.pdf
    • https://laurallo.com/ckfinder/userfiles/files/vijujivabaresug.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ddeeb9f946055a57b2add4479cfee98c/tuwepanawaliburololilimaf.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ebc916706bed147d4887219d2405e989/gurunupukevixokajaza.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bb.bin
622943e61f223ddcb21caccf7ea044e17a87d833f8652e0d7a3c730a5aeafb93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10120 bytes
font_01_sfnt_off00010788.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16160 bytes
font_02_sfnt_off00011cfd.bin
61354704a4aef5b7ed2f6851a74300f5c63db3dac219e9387cbe497e719a2b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 18492 bytes
font_03_sfnt_off00014e12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E12 16792 bytes
font_04_sfnt_off0001661f.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1661F 1692 bytes

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