Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc34f6af0cc9923…

MALICIOUS

PDF

86.6 KB Created: 2021-07-23 00:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea6dc58be937d848262f08de03549f1d SHA-1: 3dc0f6d58271e8dc9e1ddf530353982c7f995441 SHA-256: 1dc34f6af0cc9923f250ba8f7af8135e8b2ae158933cdd69dd9dd681f669d134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are used for SEO poisoning to attract unsuspecting visitors. The primary goal appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m1h6c2qc7ii9cade9ejbuu1ldr/soperixixud.pdf In PDF document text
    • http://hanleyresources.com/images/nazelori.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c392329cc---76387728334.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/zozagu.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zukekatutifuti.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/47824092661.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6776143879.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/54430221895.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mg5rijdddd0qkjj2ibupj2dip7/77614948968.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0785c46a14---26803349095.pdfIn PDF document text
    • http://usmleworkout.com/files/file/57578294949.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xizevedowerepan.pdfIn PDF document text
    • https://basisnomor.com/contents//files/meziwonikexe.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fewizetebarijetajupid.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/4b099ffd3ce4cfd19edb8f1eacce8d10/fujaretok.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/64970102795.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cf7d69c6375cefc0e866de8d3851ea98/neponuzozaduzuw.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/sepoxemosojonapusawudisi.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/xopukagu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f4d6ccf8386ce1b26183e359ffdcdab3/butoduzotufederip.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/vuresazaxininemazolodob.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210601112810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=non+sustained+tachycardiaPDF 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_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 17032 bytes
SHA-256: 1a02522ebec2a7fbfa22246027b185fdfd9cfdf7ea09860dcde7911f84b23610
font_01_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 10612 bytes
SHA-256: b594c9fc966143e6770a999618e228747d84c17018a5554ea02202b0aa9fd521

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