Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa96e0adb3ec95e9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 13:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc72a842119257b43c87af9f5625afec SHA-1: dfdb238499844c3d041ec44173046fb8370b9071 SHA-256: aa96e0adb3ec95e96b0c1095ba2509c55a092f3a6c8e85c5dfaa8cdc917cb710
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure victims through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=abrsm+grade+4+violin+scales+and+arpeggios+pdf PDF link annotation
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210802042733.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/merexetunuxegagiminotaf.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13d713fb89---89418119673.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/12974747799.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/cee936278787775da1ac0e58268ae056/45490446256.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a55a0461---juxitoredanobivevesa.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/80726a7d11b87e78b8406bf5b92a92c7/20256010375.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pjjacqp41v879crnfna5q82fd8/kenomanexejodalixejikije.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076db2f7cd34---zabadibanirutowat.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/38424625000.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073028b6c7f1---41849621286.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81184083280.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/nixisawuxobefizakojo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9431bedcc195913ac95cf0983a478b35/42637949436.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/72023807339.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/1cirjaee7cdvprv6e8mufrcvf5/7709798468.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/98494092130.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817eec80b1a---77042892017.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/48798206625.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/46640711258.pdfIn PDF document text
    • http://creationart.hu/files/file/50560291440.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/monokitejubepajik.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_off0000c22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22D 11132 bytes
SHA-256: 9d92365dfc1b8130290e5af68b222f9c709b943160b88cf412443863ac98933d
font_01_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 18076 bytes
SHA-256: 3ab790bb6c449459a2f27c461ddb7c47533c337ad52c0649f3470bae9ecc2451

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