Malicious PDF — malware analysis report

Static analysis result for SHA-256 79794823a7c441af…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 23:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0de42dc69bc277057cc9d0668320166 SHA-1: ed04a5d5dae8b311ca06f77aacc87c461e8b52cb SHA-256: 79794823a7c441af7a82469619b61b8b3bdbdb3848cab3d61f78ef04fef0ae34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=fifty+shades+darker+full+movie+online+free+123movies PDF link annotation
    • https://bharatbiodiesel.com/userfiles/file/mefoxoligitoravewakimum.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/79568872484.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/53762296082.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614052a0c6f36---netof.pdfIn PDF document text
    • https://premium-house.uz/images/file/gusezikenizenuk.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916004925.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6511028afa4e77b7884961a056842d47/zatamuk.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/tumusosorumurigimimewev.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/mifizowolegazoworuka.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/petirafes.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vapodurogetobewu.pdfIn PDF document text
    • https://cristalensi.com/public/File/98621520051.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/wuveliziligavebomonijeze.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/12858815090.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/fikoxedamubokevedowodub.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_A7305031A48F2C30.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/soponivovegakadowefufil.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/49291496886.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/18468839939.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/76965748698.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/36663980492.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161369f466a6a0---57186132078.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1rjo7hvnfbrbij50qvprb5nrb1/54250764966.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/pukif.pdfIn PDF document text
    • http://www.puhito.hu/uploads/53396239774.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xibeloloduzapuxowa.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/luvajazigo.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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 17532 bytes
SHA-256: 8ce9dbbbb9da5180f4b8ec7c4d9f7553c015a371cf4a15ce75878edbec9f1beb
font_02_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 11312 bytes
SHA-256: 06efd235ac891c0667455805879267841a795035e47dceb1c58f57fed2c22436

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