Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10c3cabde0e952b…

MALICIOUS

PDF

91.7 KB Created: 2021-06-25 19:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6c15b409e954009cd4e3cd63cbeebe6 SHA-1: 4229448e0c95116167c1288630cc4014ad4c24e6 SHA-256: e10c3cabde0e952ba50b4da3f487eb3bd631816cbd599b6fc3ebe17a1cca430d
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. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=home+remedies+for+infant+fever PDF link annotation
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ac33524a68dbaf40688a05b83bc36aeb/fesesolagobatefolu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e719b1ca8e---55437531225.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j1nrf2sr11l1t5fb769u3fioef/16703154492.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66406820c---duradulubenegum.pdfIn PDF document text
    • https://epiphanych.com/images/file/kasuketekipagapegukofel.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b53730b9f---8992488770.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/13532312535.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/92150328502.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb5acb7ba---gamisodawojodajesawigavor.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609634bab9824---59914911524.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc4d3ffea---31857288124.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/kijan.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf742c764---fafufifigekavesakisexit.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160965fda9fe10---13971181649.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9fe9d6bd---29212832525.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/zejig.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/99125134626.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gnl9f3m2u78t97huj0p0tt45cf/35164208008.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9056fe0c15---86248391015.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a585661258c---setemiralapulerikag.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9e43206385e9d87f6cb259b9b9f012f1/24105172438.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b88d74b51f7aa9857360681b001e5b8f/40483511640.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/polomogarasowegujirot.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba5a928b4---39008589568.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a810cecb3cc---tazuxumisetatozuguxuluk.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/gekejudutuzowizisotalez.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_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 17012 bytes
SHA-256: b23b2903f44abc77975a58bd83a3039505bd54dca551c5a2e1a44f3b61a0a706
font_01_sfnt_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 10524 bytes
SHA-256: 2c4ab28c365ddc1205308fed6cf69d7db26ba3c25efef50a00503742695e36e5
font_02_sfnt_off00014905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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