Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8494e3f8012a2e7…

MALICIOUS

PDF

101.8 KB Created: 2021-08-25 19:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45298a50af6b23c924908040fb18bad6 SHA-1: 739380b2f7e4ed37707c818e7edfaf3789285044 SHA-256: d8494e3f8012a2e79ecdec8a508010d930363ac89c57149289b299383edd5712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of numerous external links indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161042a9ab1f2c---10970867323.pdf In PDF document text
    • https://mauspro.net/upload/files/burotofilinalobamopezin.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6b730af382efd31213a6e062d706c589/11649318762.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210807054322.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/55196799718.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/vazuzugavojobotunipovaxak.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161132c84b3cc6---xipexe.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/2952695146.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ed0fafb03---70776922765.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sujiwukozirinekomaf.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/56285156686.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/12498483577.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/88184980056.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/67648774192.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/38517707209.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0fb8d56d0---19367982398.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/korisuvetajimatubuzenizuj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0f037b524---dasidamelugewe.pdfIn PDF document text
    • http://greenld.com/userfiles/11190644912.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/06/file/20210806_043032_106.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/kamowibafadisafojori.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60440513106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=governors+of+indian+statesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016b40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16B40 18016 bytes
SHA-256: 1cb5fc130e3d2b32ff3d6dd9835da1772171ade6684341845cb5118a92b27078
font_00_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 17500 bytes
SHA-256: 3fd671bbc244f15b93c21d0ee44f3ab06bf36a931572c653446e3c1211966f59
font_02_sfnt_off0001537d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537D 10408 bytes
SHA-256: 469e7e52df49fa4d8bc37ce3366065a11e868dcbc989007080f0f55eb52ad016

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