Malicious PDF — malware analysis report

Static analysis result for SHA-256 342a991f152295b7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 06:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f31c53a2e01648070fe457f4af3f025a SHA-1: 2f7d134e1c088800e16a55ab27056b8c01743fcd SHA-256: 342a991f152295b7fccbef8670db6faa9caeebe05e1f075849b4006a760fc8a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l0ve36fok481j728g2i6am80fq/99916739640.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a83eba61632805111476a3c3ca51fa3e/83431986389.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16114236203b04---nemobuwezazegezowelafu.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/98670338426.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/kinesafipudetadukijix.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/sagibomoxomuninuro.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e1a34ca6---talilitobalerixobibawi.pdfIn PDF document text
    • http://sparkpro.lv/content/file/34184064720.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719481335c0---webatudodepilevedosonur.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wejirawizopijanini.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/29413cf7148895a8e073f69d208b053c/90719540041.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wamulimofilevipemuxetor.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/34483247580.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160894d7419ca7---44573876126.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/75185220840.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88083b4bd---xatizoliluvu.pdfIn PDF document text
    • http://ipllaser.in/uploads/dejujinodowu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1c59b8f3f4414eda15458e67a61a0620/92827109534.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/milofetifesavexeli.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65418013603.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb632b5a6dc6bc4fceb162f4a879a92d/19705238231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tipos+de+adjetivos+y+ejemplos+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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 20008 bytes
SHA-256: e37878ad3ea5953728ff04075a33bd9b56efe922e6082ba86c798ed5951d519c
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 10728 bytes
SHA-256: c46eb81d028e68d7a8768e02b4fa7f358a6d585db15aa7c394b93da823e77484

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