Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6beb259b2f13cd1…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 20:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1050817f33bd2fc5cd91b0f17a55fef0 SHA-1: 3e49bd1782bda32a0b954088cf35ff9cd2b3c201 SHA-256: b6beb259b2f13cd1aded7c267ffff26794db39b0f55a0010d68a2570a77f22db
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. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=this+is+certify+that PDF link annotation
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a15b6cd21cfa32bca53596d3c88f0d41/93099075528.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11d4c2308---60687147179.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac480e15c0f---xanojuxaxugewibakofib.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/60m34er5j7n53k0gbf2h1g0911/tufozirosepuze.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/11539844139.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d659c05ce41---15960086884.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5c0bd60e42fc4c8de751f3665f097d09/wemanosemapokoxiwok.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/8145143416.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5soufp8qpv1qlqorq84bc069s6/ferexaruvubo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/imnp2nv3fb5e97089422p967m9/dukanidisido.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/davebak.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/45088667539.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4a2e0f7d446ae5a90b9af6fcc093b4f4/kabexexakipevoparusu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lr88p7v3ofb3cmfeh573299qgm/46357215216.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/76d5311a970aefdb3fcd509f18273986/72950198167.pdfIn PDF document text
    • https://luminex.pl/upload/file/vavawazikixap.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/lejimezapevofagib.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/zezimopovepaxuz.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/274568779.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6efc842ca2---tizubotobenerinaresavi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d11b3a134b0dee8ff85354b179161432/34603772995.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609b387cb8bbd---powab.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_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10240 bytes
SHA-256: a141376fc79abda65f39b1a56b7b6a2f58e7b87c283673bf0fe50d60cff81766
font_01_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 17360 bytes
SHA-256: fd361a36b32dfe9ae2a0a223725337a436b7a25216a57de341da2a04358a5867

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