Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bac6ef85e4ba26b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 00:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 626a552a3bc4cdae9ccf651358e4df46 SHA-1: 78f6b5bedfed8e494f635f2c78b76dbce5458b24 SHA-256: 0bac6ef85e4ba26b8f569fdd052bcec7e55f18ea3ad94033d8a541d0028fcf66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=the+secret+circle+book+1+read+online PDF link annotation
    • https://www.tamilsaga.com/ckfinder/userfiles/files/41165053161.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138510bc45b2---zelufaxupufisuwemo.pdfIn PDF document text
    • http://dytac.hk/userfiles/33771800673.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/83101003403.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pojanosaf.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/98849843556.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/90099166053.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1fb17502df5c3082d40dbe86efd4d/93786083843.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/vonijovumozeli.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/54272267179.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348de9b2108---jidoraxutedepubis.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312b371a792---puxeretuguxab.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/lapuvowimigidowadulupe.pdfIn PDF document text
    • http://dnepropress.net/files/file/31502198733.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/zuker.pdfIn PDF document text
    • https://digireg.cn/upload/39172487031.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368fd7e946b---27869417099.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2f623843---watumesipexotubovidobo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468d36a1fe2---topeketavipafel.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/sagurabujuwezibozirexosow.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091018035373499.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/78554885253.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 10716 bytes
SHA-256: 51d3b0a2cf7a7eb72fce1f7300de5790448c8769bb41837fbf351dd51da5f428
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 17480 bytes
SHA-256: 4a601cdd5dcd71c122c9c2b7f3dd68af5a4657016649a4fb10791629dcbce604

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