Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c70656ab3f2f7b…

MALICIOUS

PDF

81.0 KB Created: 2021-07-21 03:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2bf027816016de683aab7d6fe675787 SHA-1: 9d9cbec936663a3a9ec254d1ec366e19924bacdb SHA-256: 52c70656ab3f2f7b89d6ff1c153ff58a5321ced17d29b75f4173f56d41660629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains identified as disposable hosting or compromised CMS uploads, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://tipsclubcr.com/campannas/file/wuxofu.pdf In PDF document text
    • https://serwisnawigacji.pl/userfiles/file/73852849957.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cdfee7984---71175882435.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/37332979705.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/52463421132.pdfIn PDF document text
    • https://afayl.com/userfiles/file/tatulebovitokejifam.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/rojoburiwirafenur.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/71246815977.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/4707833026.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/mipojeveruwimep.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb580c1de5---15546275589.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b2feadaeb41654a98e755a1e9fabece4/juramaxinezabemevita.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/56309664495.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/nogepa.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/garegowuwovupij.pdfIn PDF document text
    • http://atek-ent.com/upload/file/20077994339.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa242e0a5f---82914970981.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df362bbddc---pusigojakuko.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b5a1e2c57fccb82be53be7c597cf8c71/61718740463.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ec699851---rusomisewage.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vavoz.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/saketujudenimirur.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070b2237da---pobobonawolepujosupepe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a233baa4917---56917319541.pdfIn PDF document text
    • http://martonelektro.hu/files/file/wenebegile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tuck+everlasting+questionPDF 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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 10772 bytes
SHA-256: 13727d5ffc357f93c8b256d027ef620a5316bff8906c6463f7829e052a76be06
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 17280 bytes
SHA-256: 0a09a49a073a5f268587db668d5d976f5f154b3dc5e2a49a9e952a3627cae818
font_02_sfnt_off00011d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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