Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef06ab4d66583f3b…

MALICIOUS

PDF

127.1 KB Created: 2021-09-02 16:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66c13f10ceb96880e3f9563ecb3d89a4 SHA-1: 21d021368e5adc795b14cf5f71c1d17b497e1466 SHA-256: ef06ab4d66583f3b4df2904ad8a08cc200c4aaf0f6b963285d05f01590f041ff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, such as http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123630053e8c---parelizogu.pdf, are likely part of this distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945c1c498db---pegivafokapamopot.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0d9f0b47315a2191e8408b94e46c25eb/mikipavujipaxelan.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3737d2750cf7d40b2e56a4c5dd7dfc9f/44003231772.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/tesenanujepoditirelotebuf.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed364de147---26816822783.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xavufawenojarebigan.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/41ed2b9d14556295bd216419e4df6aa1/karigedajajoga.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/dowexutijebuve.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf5955148---43506703200.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/watukidaludikenapeselob.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123630053e8c---parelizogu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4sh629ae8fu2cp8rumj4v9dno6/peweweruwekakukinar.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8131c1ac194d53fd9fd16cde98dbc424/wefetimomuvinilepaxeb.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/284306176.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fc4d03f4206f6f00c0da205b5bb36c4c/95609569722.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/53034647268.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/85119050680.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/35845550307.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/rofaro.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/72fef8fcffff3b3b24f20e1dd1bdaa69/gataxupos.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea1876a07---17074412641.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tuluki.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/desukepulupisawolabiwovab.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/fitukofijimoxuzeguwajafef.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/xafulezetakanav.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608817c627374---salexejederumililipeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=saps+internship+2019+application+form+pdfPDF 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_off00018a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6B 11424 bytes
SHA-256: 8cd98e1e872241693b7c493785db661c3181968631af2cf15772ac9e87f6a626
font_01_sfnt_off0001a538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD4A 19300 bytes
SHA-256: d8bd72191c699dbf5f3172cfe1206ba7ad259ba7d9f00284a24fe249e0f0e996

Open this report in the interactive analyzer, or submit your own file for analysis.