Malicious PDF — malware analysis report

Static analysis result for SHA-256 a814e2823db14d70…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 03:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9463ec8af3f993d502acd4449621bd81 SHA-1: d47e2273195131c8548c10fcabbb3f28efd795f0 SHA-256: a814e2823db14d70d5e3ef0fc2ff7c591f9c40a3a0fc88c1418635d7999adbeb
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The presence of numerous external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nabil-doukali.com/userfiles/file/binexijide.pdf In PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/20539953189.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/dowuw.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/janomodunulewolaf.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/wokoxilalidinor.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/33917700150.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/jugafetokoli.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/laogb064pib63th0arrp2nkk47/gawovakuxukomizeg.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/bunoloroxogokopujox.pdfIn PDF document text
    • http://01host.ru/userfiles/files/32114878719.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/bawonafabinali.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/zusujivixusiwafepifemilal.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131652d9e194---87516528889.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/28749276399.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k2rvsnd6jm0lmj4spulfb305nu/6768469678.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16147a0af4c86b---nenosaredudupotakujaduk.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4c5cf99e7cbf7f5abb6c0204e396b357/rarevedizopisumariranezu.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/fepifafofivezipirunalulu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373f497efba---xavazonidojejeruxedoj.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/66140428588.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/32281054699.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/81661426697.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/6bde95ff791b24e16f56d2ed30d94eba/posefuxiketisotemobevala.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54936425990.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wasotiruzuwewusigokomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plex+apk+modPDF 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 17260 bytes
SHA-256: 4ee6ea28c66a12547575f2cb42bdc6519da7779914186ecef5c07525ae66f16e
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10188 bytes
SHA-256: 75c833301f578fc09f8fde3f071d7da94253adcfabb5d82a6b7f604b45b76d5f