Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8c9591eb53422…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 12:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43c8ddc5dff472a2e13cea76f8b75f0c SHA-1: 96ca32c768e681d702b6e92cfeceb0a72c9d8b98 SHA-256: 13f8c9591eb53422ea4b2d7e2af2db5f5c56a734e67f0cb40341e7a36320b831
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=the+demigod+diaries+pdf PDF link annotation
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/xadelad.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/demojabmu45pgp06j35vtkfst6/mugeliwizepefegutegurix.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/38124985113.pdfIn PDF document text
    • http://ippon.lv/uploads/File/piwizuda.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4debcaad6a3497179276ff0b0d6a91a1/35338614075.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/53529475804.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/zavaliva.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5aa8cda0f28ee269942c003ff81ddb7e/vusotekulapewatigefomu.pdfIn PDF document text
    • https://armenia4d.com/contents//files/66344114086.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/14013953048.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a1100207---fufejenasa.pdfIn PDF document text
    • http://altus.pl/userfiles/file/dixoresomivovuwupune.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/pebunomufajurerugokuroduf.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/9731456588.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3b22c777---84697728819.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d455ba9806---62835276184.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wakomavazopusavodasuko.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/27384875221.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/52292914402.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515090624915886.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4c2c1ea847efae02550facb3fb1fadf3/31924132101.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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 10660 bytes
SHA-256: 12458ea0d5163d04dbb640f9e7d75c1cbe8a3057cc168f4d13efee06c7292c6f
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 18156 bytes
SHA-256: 6a6268ef8ca9016a6f6bbb7218e6f710725bce1858e63925a8d985d4d3046a2f
font_02_sfnt_off000132ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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