Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8b11e0108f2134…

MALICIOUS

PDF

81.6 KB Created: 2021-07-08 20:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 53435bd3e5fb02a606358c0e9be88112 SHA-1: 8674bc1f7e0cdfb2dcd51726745021f02988eeb8 SHA-256: 9d8b11e0108f2134f368a915442f146f252215b032f572072be25fa35a7e5b49
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=icse+10+years+solved+papers+chapter+wise+pdf PDF link annotation
    • https://stijsr.com/userfiles/file/21789402593.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/vujowesutepajutemepeb.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/pamagaro.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab14fea3939---92489017297.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c44364730bf---vixeresefikatasesabotik.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/617a95221d4c6cba567fd8d8f56b3d05/96913194239.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8531a31a---tekagib.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/sekexonuxi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ff9e3dd359d4344e2a370aeb195b88a/bonumonujumamodoxa.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/de2e1da818b82f58ff23f2efaf55100e/39861904748.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gebawikixodotezoriko.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210522235335.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5f1d3041---tidakuwoxubuxejodof.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52b71ba62---xazabifenudemujure.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vejefobujilutoxal.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0ef5647518d810783ef2a1401e155199/21868601319.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/418e231e23e6ccfc76fc3066de8b85ed/dufejanisiwabug.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b876c60224f---vokokolupipefifodo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vowopi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a13c438f4b---98759062173.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/wukisisajilokega.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bb6d77ff---rokunonezone.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 11004 bytes
SHA-256: e10ea6a0c390d6c58ac4d1a4c96b583a464bbcad46244803966d337d6a9d1fde
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 17056 bytes
SHA-256: 9085d1ead8e096a4cb9b053359fe25fb0eda06470179d8dabe3a3f20bb980777

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