Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ef396b719129a1…

MALICIOUS

PDF

114.5 KB Created: 2021-06-28 17:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c0adf816c50e180aeccc4e5b1cc0a63 SHA-1: 5e88513052cd470e30ee89e2397369d8ce1161eb SHA-256: d6ef396b719129a11a178d31cecfed864f4d7a8efc0f9132304e54a444fad3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://m3csrl.com/file/77376371014.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a7edbed12b2404d0fb5ddb0c5dc7a5e0/pusowat.pdf
    • https://heritagecambodiatravel.com/userfiles/file/pukadaderid.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3fm8uhukq1cib925cpsvajeuis/jimurovemorogibupigamezu.pdf
    • https://ludifrance.fr/userfiles/file/jexaduxugupojaxewud.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b2a2121b---karupa.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/abk6cd577p2tjdpisqpjkaona4/82970534315.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2165ec813---36667252766.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787c96b1c1d---85424969190.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c490b273---99597251455.pdf
    • http://bukhatirhomes.com/userfiles/file/pusorarubadasosalerarivox.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b51811cd3---70524201116.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/rojejirafijibusofobagejut.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0490e6bc---kasodojuzanavezodeme.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c54b5eb04f751c9fb21d8fe91db5e09d/18292344054.pdf
    • https://aplusadvance.com/naver_editor/data/file/jidadifapusafupomod.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0ad210960---12184894800.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2lvpof061lh3rrcumff15eluio/95316375528.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62fe44a8c---11697129322.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/av162kd9fmqmfico1ucr0r56bs/bedevepelagekeva.pdf
    • http://sieuthikhoacaocap.vn/upload/files/lusawivelenejopojanidav.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pnu1lnb12b0443fjsver0fhf1i/vakanolizosabopemefijez.pdf
    • https://systematix.pl/userfiles/file/26027189002.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb19d945d---21911552385.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=protection+paladin+wotlk
    • 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_off00015cc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC6 16792 bytes
font_01_sfnt_off000174dd.bin
8d24d02dcbb56ef63345a92d1d1e60ba02caed57fa2136def7e8aed88ef3b93f
pdf-font-stream PDF embedded font (sfnt) at offset 0x174DD 10520 bytes
font_02_sfnt_off00018cee.bin
3a23127dee801ebae69ba6c54c0664e3adb8dd20e8dc9f7caf6aa51b4ba6ecf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CEE 17636 bytes