Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb752b43f21037a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 18:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 163e41ad9a504524bed25a867df4613a SHA-1: 9ad1c8b99cd2be363f6d01fda381254036412fbe SHA-256: 1eb752b43f21037a1c32d90276a64611b75414e727cdcdcdc62121668977a5f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, containing numerous URLs pointing to compromised websites that host other PDF files. These linked PDFs are likely designed to lure users into phishing scams or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/8it9oo835f48v4ueqfflskv170/fazomuxisin.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/332248a9d54f2c96d927b056f76f2724/juwajed.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61fe5a502---lijaviwiwewoba.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/bewutawajixesuxik.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a51b51b4---21968911915.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/milalif.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/230075dd0c3f7fd3fdea3fc468e6843e/nepuxixitowi.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/bowawufujuzenukop.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kotemupineji.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cf6de510---tadusuturegiriweji.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/900e4552b128787b9dc66313759cd4f9/zapivoravebibaramaz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609262b8ed4ed---sikivarero.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/voxokujifizejineturosune.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lhkg1g6lg2t0d0nma3je558j0v/nebulutavezuzexo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/87173361022.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/35951539501.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b87ab023---14270562086.pdfIn PDF document text
    • http://promador.pl/userfiles/file/22187839210.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ag81o1hd1q6de54p0256sohsl3/39503031622.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b901875dc17---kegadagim.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf29b33c4---nomivogodobike.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fce93b57cf736667ecf097fc10ab281f/10765626404.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070407120bf3---muduxuluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=right+to+freedom+of+speech+and+expressionPDF 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_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16856 bytes
SHA-256: 848ef3d3280ef8b9a12bec7d7ec61e78957f66e9872e867206e761d6ac50a101
font_01_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 11168 bytes
SHA-256: e4a7c99435440fb15f99d16cd9d6f430d538caffb82d0ff45c7474c3e35d0962
font_02_sfnt_off000141cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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