Malicious PDF — malware analysis report

Static analysis result for SHA-256 67eac3fb6c82e32f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 21:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2839375590bbee1c8962843b8f5d1de5 SHA-1: bcfa317afd10ac4f5ba5d1d24114b1aaee14bce0 SHA-256: 67eac3fb6c82e32fe348b5eab1d9be2ee6efc9da8095afc5cf24f28d29ff1547
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. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting services. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://chcial.ru/uplcv?utm_term=omens+of+love+score+pdf PDF link annotation
    • http://lactopad.com/uploads/files/29325557802.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e3da17ab66975b508a48c728b6c884a/nilufaselosewoguda.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/24023540169.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/73955386722.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/lasopajibed.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210823/files/20210823213604.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/31684617287.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f15b8df8---2190875866.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f969d1585---sesebepetizab.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a10fbd5413b17be774e29ae71776df82/noromexukutatanefawaka.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf80f151e---tuluberatevuriminubazib.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a56cd8e8c9f0c8a0507a1c318a3df43/51841500203.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/9263422323.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e610345ede---bapokuforafozimalejidi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ed0331e68fc1fe637460d224cebc126a/74736696856.pdfIn PDF document text
    • http://youil.org/userData/board/file/tefodami.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/fomenanumaxubulo.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gelegadokubowop.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78475214836.pdfIn PDF document text
    • https://coevent.ru/upload/files/26538355628.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6847d9db5---buxipevopubugebefawi.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210703_81FA96E55CA78C20.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9ac0abc3a4664e52fc7e1b01e958a64f/juriwati.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/ratigimewalagifajebetub.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b039743e---58403390932.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/84375000136.pdfIn PDF document text
    • 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_off0000b79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 19880 bytes
SHA-256: c83a3736b2c78e93e04302e54d0c700bd44f4da928aa522593fcc57dd8d5f96e
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10520 bytes
SHA-256: 668cc25093c67d017b7d54f9532db55c4e39862ac4ca6aa55d3a937f0f5c9389

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