Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0db3248c63047a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 21:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f60b679f41745689bb45db59b06be06 SHA-1: ed22ec0e64812cd59b2da1dfb35921a0633eea89 SHA-256: 8d0db3248c63047ad204bbacbb7fffdf3ef7c76a514db8c671c9255f3ae7ff13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hoejv8o43hno1sftt8kighdh40/ruzadetuv.pdf In PDF document text
    • http://kppzp.pl/userfiles/file/gedukiwefipe.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/19305103996.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20577eebe---81692614293.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eaa776ff2---52562709479.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba953131d2---31648057475.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db7eaf053fc7c3576eb06567bcd96a9e/83211262126.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4e587b68796b69a1da148ab90d88180c/bulazupuma.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/589b1b7fd12a8a4b03322cc816062361/wetawim.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/13181162891.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/niguzagarepokepofekojutob.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2f9930a5309cbea355c7290a65c067fb/timubazakigagotafiti.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/bomejo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f451679a39---sawirob.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e8a48208---kuwonukezowoba.pdfIn PDF document text
    • https://12tiga.com/contents//files/90204680646.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/fisibibafiruzufimilabek.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607162def22b3---nelexigugu.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/34745861142.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2al66hd5gsfm1vhl23hk5aun53/pusoxu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b8b9dd1eb6f6abb9c221bbe708515de5/fagizazanezisene.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/reverebujataxag.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa04ef3ea4---38088443696.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e815c13068415787df544ccad7f6001e/walefexanenusujux.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/26b771c478f95cf368b715c2297eec5e/meneleti.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/25344273839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=town+of+west+warwickPDF link annotation
    • 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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 17220 bytes
SHA-256: 4e2d15a43937089c6be305dcafb1264ffee4aea29291c809c90a6a2086454ae8
font_01_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 10424 bytes
SHA-256: ad29558e1cb00ac22a9414db5196d827a67bb39a842d4f358f69fac940e12d3c
font_02_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1