Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5418ac459737281…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 16:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a3a0f55e0c08c1e3d0643907af110f7 SHA-1: 36441c03058f9447ea7c689cf7a966740bf6db63 SHA-256: c5418ac45973728188dcd158ce2cfdd533a26d36380bd2c35174e56dc2ebde34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable hosting and compromised legitimate sites to host or link to content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l1s1qjk8uqe9ed93pjiftu0lai/dumogowexabafak.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b28641838aa34980ab1b1552ed148fa7/fofoximemixud.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/75359932047.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/69499099865.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/xusukapuz.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/77008015120.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1ab09494c6af9b750878ecf65d4f3f87/18328038716.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/13167818816.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/68209465124.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160747d1004c14---80658414649.pdfIn PDF document text
    • https://ebooksweb.net/files/file/nusujifewezomoroto.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2958b129bff528b268499a37c6c344c0/xavimagogopun.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/mosov.pdfIn PDF document text
    • http://kbchina.de/upload/mumufowe.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/retagavitibefakar.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/5ckd8utq91iueh1e3m9krl38s0/7326141937.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/17012963248.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6d3c6be5c---rosozozuser.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c21ee228a---kifaverexu.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xituvijupibapoxesuxuti.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1898024f9---dusofulorowajarerotarinut.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wevojefijeligude.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc35358ce---5211248844.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/debifenimuperaliwujuluwis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ra+7836+code+of+ethics+for+professional+teachers+pdfPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 11360 bytes
SHA-256: 6968b066462a025391daceb18b45fd33fe3706da64f640a963672fb339e92ba9
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 17668 bytes
SHA-256: 1019ae46372d4944c62f9e1f6adece4dfcd7c399b9152a11731075392a785c99
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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