Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1bb57dfdbe9aaa…

MALICIOUS

PDF

89.1 KB Created: 2021-08-02 13:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 04c640d6aacec6ec15a2c72e4a16aa56 SHA-1: 3b50fd6b09fef196ec6ae977ab6854c3505de1c6 SHA-256: ae1bb57dfdbe9aaa4b8a8f0418bb90297d4ec406a76310b164abf917ae27c288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to exploit user trust and lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://medvor.ru/uplcv?utm_term=gta+5+ppsspp+zip+download+highly+compressed+file PDF link annotation
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8fb6f0b1ca0f49c0a67063cf86d3ec64/noxixawupan.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaae254d96---11585701396.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9pla0o9pd8a8maa1i28eopmn83/43217133740.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ab7373873ad43ff8be7f104d888f4b15/73490594988.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/eg47duqpab2pn9g96gkctgkf2a/xajesi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ce2ec3a---rotog.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/85674774086.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/80819228578.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c068871b13b---xiwebefar.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9ab5f1faf---74827475835.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/69918330813.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a5611d89c8284960fec4cbeb43e14d0e/69467653579.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/70534383638.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/11811703472.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/91879270175.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ubssjommj82o41i5ih7bo91ti2/65893747454.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1a115042---gazukibapuxabawokufoze.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53804148728.pdfIn PDF document text
    • http://chongros.com/userData/board/file/38875037530.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/maxipixovitire.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nubexorunum.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/95055514451.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/revile.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/57483204490.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/42941626014.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29c66671d1f4c79d3f3d22bebb8030f4/36107198142.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_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 11500 bytes
SHA-256: de4a8d67d6fa846a401d5284b45562e6db7a8c9f60162f4fedbb4ec5a577e9d8
font_01_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 17396 bytes
SHA-256: ee4c394eb01200b67a51582807efb87536dfa71bc216058709eed96d103d72d9

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