Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dd22458cd7ab17…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ea45cac38e073e58c251877ca541b22 SHA-1: 28e4f4f746b8b141875048964ec11a2494075b65 SHA-256: f3dd22458cd7ab173efdef0260bcc1ade4a4f341fdaea0bec702cc5ef09248f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to distribute 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://drafthe.ru/uplcv?utm_term=cours+sur+electricite+batiment+pdf PDF link annotation
    • http://oaklandscreche.ie/userfiles/files/wiferitolug.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/pafifinuvepep.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/32755811543.pdfIn PDF document text
    • https://mackbeks.com/files/file/15893604550.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/gijavekevajezo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p77apcshpvge2iraiptfom1otn/gabik.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/35763d3ebcbc6c90234e68203b213777/77116419752.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d4mpssltdv11td8n8nfqaq1sdv/wajipixizutidevero.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19f7e7306c---41506397968.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/059c183a70689735390ef9a62fcbe672/21762677024.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/nibowutabefos.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/80027202677.pdfIn PDF document text
    • http://newo.ru/files/files/kobadebisupuzugedas.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/gebovotelosisem.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/wirefe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/828fac8e4b54defe3fdcc5be29d7745e/bawukukowipawekuzi.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/wamasokavelobitamate.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/zibifelemomokege.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719e5d0057f---riduwovukimenazubuzawex.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/307465e461fe196f3ed9307f1333e85c/dozusu.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/543817094.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d09a26fd---tesodapenobizeb.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/29185384483.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/3758463280.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d86d2aa38e---ninakegavotumonevafoxip.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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 11052 bytes
SHA-256: 9ae8272de5c4bf1ac5cc51d385cc1539fd8d53f5cec8be3ecb4a730d6198d03f
font_02_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 17664 bytes
SHA-256: 341137a292d942fadb13692d8c3952b677eb72bf2f1066ea8c87c19242e0df4f

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