Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c7c136fb40de76…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 11:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cbbcfb7ab6d7e49cef7b00e88dc930c SHA-1: 8f57b188984ed4edfcde6dd0f0b923b711a4eb49 SHA-256: 05c7c136fb40de76cf28f5b18e3724ee8d013fbd66494b616002c6332b9fec71
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=mobdro+app+reviews PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a116ba4c---46577239498.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/95583681897.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/25cb0822a7b845fd77a20efdbf08b1da/zinawovuralogukekifa.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/21256814953.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/91611603058.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/63233949298.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/dovaxedezisa.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613faf42c835a---20448509839.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/titosedeve.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/rowanifawudegupujuru.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/33482929924.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/dawup.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/24771813732.pdfIn PDF document text
    • https://clove7.com/userfiles/file/vusejofulegunanogidiroz.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/3551436988.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/69813470330.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/wotiravemikub.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vopaxavamivunetidixulikuk.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/mimage.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/madudamuxejowo.pdfIn PDF document text
    • http://lejonhund.com/upload/bigexeg.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/49110125951.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/585f6c87e491d2d46b13105c87b0a61d/83196948202.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4evu2uar2kfk8a0eg1vgh86ib7/65377190921.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 10424 bytes
SHA-256: dfe15034b2ff996709cd451ddb6cecb0bc5ee5f66306c8e14e3cd855bde601be
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 17380 bytes
SHA-256: f996c10cb7b8f2a9fecb4663ebe684976f9b4d472f09a2c4164dbfe70bbfab50
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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