Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0f8706aeb73f16…

MALICIOUS

PDF

116.9 KB Created: 2021-07-16 11:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07deef15619b065c04f867d9f86bef67 SHA-1: 0837b43b0f571207ade4ae7a6862e262c8f13e10 SHA-256: 4d0f8706aeb73f167a103bae706239ba59e9598fdd7e9ccda86beb248c1c5d9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b10bf40---23077186790.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/zitapozajabaxetumiv.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vettnlsmc53irlaf2v8ifc09tq/busaxefupemerasupudumujo.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/kogitewu.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tiweduxedijurufoka.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/jobowazijelig.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xejuve.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dolixegejuj.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cfb1eb9bc629e7c889ef3989dcf9c68e/zulaxave.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/fuxuzazed.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/dc636f2493e4a3bc2291a840b7794106/82101482632.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/toxusafakevobetek.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/92200924540.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/3152299855.pdfIn PDF document text
    • https://soechi.id/userfiles/file/tifejamupabizasimofe.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/83897164124.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8bd912ee95fef82f14ff040f2d0cc232/xibuwifa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b0ad0144---gexomi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e05b116d1---xujifusubu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bapozexagiw.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7pobt5dct7dsirijn6do7ubvu1/66711699600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wayne+yehling+political+partyPDF 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_off0001666d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666D 10592 bytes
SHA-256: 4c960e04621f80d0bf5bd71de868e24d5547799a4c2eb8223f76ba5abe55431f
font_01_sfnt_off00017e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E8C 18992 bytes
SHA-256: 7364eeb10517c8f43ada2d996a0ef9c6075fa675a157b3ab6383b3aa72327e53
font_02_sfnt_off0001ae6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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