Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeecb9b1559b237…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 09:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0fb7c252594ba4d2ed5d13efa11acb2 SHA-1: 63768d54d9ae9b3d3775eb8521e17e8e5ddae5d7 SHA-256: cbeecb9b1559b2370d650d4501c250ff9e4da2cede7304350d4043ea47a1f172
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple links pointing to various domains, many of which appear to be part of a link farm designed to obscure the final destination. The presence of a 'download button' lure and callback phishing indicators further suggest a malicious intent, likely to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0c20d85a4072a331ebd139af450b3bd5/gufujujazu.pdf In PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/pakunujuximo.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/wumujozer.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/93113899973.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/bolejejizetobod.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/73497118180.pdfIn PDF document text
    • https://doitoutdoorz.com/file/UpN2vmtc3Xzlfls2.pdfIn PDF document text
    • http://platcometals.com/images/file/2661771261.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dcde39c98218b5a1ed8f9a22126b4363/taruxoxanatakirutu.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/17905281081.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78568222763.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/6597365845.pdfIn PDF document text
    • https://inarsindbari.org/uploads/78130422982.pdfIn PDF document text
    • http://sergeybazarov.ru/file/jegofijus.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/98205367316.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613662a919396---45842951824.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/vudiledarebemaboz.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zunodisuzipumapakugesu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/kowenitubogorujomedugow.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • http://stylekd.ru/files/26324827293.pdfIn PDF document text
    • http://myesen.life/userfiles/file/mijedepuranubetepa.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/gonumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=max+security+apk+downloadPDF 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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 17796 bytes
SHA-256: bfc16e08dcce5ff504a48930d3198da68daca17b053ecbe73dac04024f9fb8c5
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 10996 bytes
SHA-256: ab10b2385e39951124624934577de9287bfb02d404ce05ddbd11f8678ba038ed

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