Malicious PDF — malware analysis report

Static analysis result for SHA-256 f758f71aa96843e3…

MALICIOUS

PDF

104.7 KB Created: 2021-07-03 02:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f86fba23fbb3f87d497bf47a7300025 SHA-1: 10f58c1eb563d19f1844088cdca69ccaf7ee8f5e SHA-256: f758f71aa96843e3089f451c155cd06a78e48888587671fa739dd0d7356d6e27
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://coretry.ru/uplcv?utm_term=omnivores+meaning+in+tamil PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3e7c9f1f1---vaxufarimaw.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/81a71c3fcd561ae619659a30b56eee55/51234990795.pdfIn PDF document text
    • http://berbun.com/user_img/file/25423823791.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/miwoxabonel.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ebef98c15---94052505048.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/faruxez.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/sovageralariwu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8mu21dumbrqe48tq5t8gngvi55/72231545187.pdfIn PDF document text
    • http://technocom.pl/editor/file/51116742440.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/39d1c1a4fccec31d560f3c7b6e3392e2/24965286470.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/36276685170.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tizobababotab.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/fee524357623601ad703c0c945c32948/kokusakenuloki.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e90ae022fab6fccd8ebc9469091b65f1/38139679551.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/63990994413.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6e3701a5---50223809277.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/69749344683.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f411b01da4---23566143417.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/kuvutedejimibekifotig.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf31245fa6---nenuv.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/083b93e92459b9c286f4b0287af3516f/80803210746.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725baaba15f---63704316099.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/lekuweremeduxupodo.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/71172481578.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_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14190 10540 bytes
SHA-256: d96f53640296b68296d26af4a41f494e61334f2ce63339772ae6e1b8b4078a0a
font_02_sfnt_off00015997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15997 21992 bytes
SHA-256: d9c9f7ca857c6fa2fbf7dbb9c46807e0b47871662c56e4d93ddd2f7602f197af

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