Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd98622b86722251…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 04:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dd939ed8abef7229b628b7c4666f008 SHA-1: 16461e34c4679b32e69d1e281bc3316736105984 SHA-256: dd98622b86722251de3432974dd3029a956bbba7146009db2814fe5ca05618be
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://euro-ex.com/images/blog//file/butusezuwoj.pdf In PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/podikomoganobunuwu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f4f172af---medelodawupebixu.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/fajodejuwujegegubuw.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bct30h81n02rd92tbdmrt8jmpk/60766407622.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3u302287qt4u6ppqvopvfba2bt/saxuvatotavudopemekanul.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/zumaxobusuvusej.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/dopimuvuzobasojerigiriki.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/f9i82jpv0e0s7i9usr6vqa6cd5/88044234678.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/nulugifatoruvokaso.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161113420af10f---26327422370.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r9evop7ejve1v4h4j5se83cu1t/77582206638.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076696cf06d2---11930321795.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jenojezu.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/88926884196.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160877b6226ec9---16624800879.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608215b6d0f76---53957641305.pdfIn PDF document text
    • https://baongochoa.com/upload/file/19401844662.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160745f0ae981e---warikogizibogagarego.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/dixigekela.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/mabinilezudixif.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/58008486201.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d940ef04137d3a0169657e9aa3cd5ffc/wudemo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/37467177637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=grade+8+algebra+worksheets+pdf+south+africaPDF 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_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 15508 bytes
SHA-256: a8a8648e532d846899c92bd4eb60ec0382c82abdffa6c2d98b521c580d7d4215
font_01_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 11460 bytes
SHA-256: 582343ebf63c75bea308f22ae16912e83f5dac51c847cbdc643ceaf31e711c33
font_02_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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