Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cff7b9ee2992ab…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 00:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 449fd1d6a694ace0ff7a4c4099f79c9d SHA-1: 729dcf3b011d547ff97a371ad6c232ad1b9f1856 SHA-256: 52cff7b9ee2992ab92b0041a4f2d82c45a711e2be817acc9064017b38b7be2a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The document's structure and the presence of multiple compromised CMS upload links suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=muros+de+contencion+de+hormigon+ciclopeo+pdf PDF link annotation
    • http://dolphinkorea.com/files/files/56133136182.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31894b6420---nalimazelamakobu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/fisidorotobafizole.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jozawedugosebi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/845e46e222bfc49014b095c40b7b151d/1340197103.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a942e49e2cc---jisakutupelokegoratexe.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/22077417908.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ouolabrrn97gleivjf10c2runp/93329377613.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/fe31282776fc9a7eab880d1d9285d1ca/luwatatibipulozaz.pdfIn PDF document text
    • https://renault-service.com/userfiles/xijelajonelizifimezosena.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160943895dcad4---35921828070.pdfIn PDF document text
    • https://vleek.com/uploads/files/xoxexeminisesifojefa.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6a782d7d5306f08d3252424ec37bd228/67517452261.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897bc2cc997---wuzapavajetazafapij.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/disebupob.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/dukifizi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0d10f219a398051182dd827184e61eac/satorugizakezibojume.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/14316355616.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xinuz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/278db6d5b22436128148bf3287b83349/41403264485.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/71529937250.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zifadebotuvuraf.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lidukusazemoxegalul.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/nubaripakopekod.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/92624754234.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55791664257.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d02071ea683683590fa4df19dc1539fc/murupujobulif.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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 10996 bytes
SHA-256: c5a0f7208d5fc99dcbc3e7c8b2fd158346554579c2c0d6bb967a72fe45f2e08d
font_01_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 18812 bytes
SHA-256: 0aff428d84918c614ed502c0fff1c53e3ca4ad18c2448387551184acaa64ec3a
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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