Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d196bf1d6ba147…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 18:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38fcdb8a77ea8cf17e747e441c359cf9 SHA-1: 5af403903e418c8f6dfd56648f68cef0152001c3 SHA-256: b8d196bf1d6ba147a1f07d57f022426c182d0085995c5f88ba3031b6d49287e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which are designed to lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.studioline.ie/ckfinder/userfiles/files/49626208191.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5baa18abfece62b09bd685d837ecca8c/zakipowitukazuzig.pdfIn PDF document text
    • http://cortabellanews.com/userimages/5385416694.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e929872b620---3101665329.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b65nd1v5f9rkv2eo7iongh1ts6/45661516724.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/4068555677.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/gufixizuregaki.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a249c348b31aed021f1a2ed27df1fea3/62302222649.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7021191a---mixit.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bivaxajuxoludodudajef.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/nezugolifulagalefetigivi.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/denewadonujo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb4e984201---mubaxidolozezuxugif.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/80596530204.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/78796947328.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/wozigawabad.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sised.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f800e40cce3---vinadunonurevavov.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f06a9731---7515630421.pdfIn PDF document text
    • http://islandpointfl.com/userimages/81536480753.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/349957d43dfa3c3e21727f26c49277f8/pomexevopoma.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vomijidil.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/90254408678.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b984678c45775c80901c770d5ee02c37/wulaj.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f98b9bba3760af6de01434ead1052236/95166571378.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290414111696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=zener+and+avalanche+breakdown+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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 17472 bytes
SHA-256: 51857308cef8254c46f4c88cd51e2d5f1734a3ffb4dd472f6983edc32865a652
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 10708 bytes
SHA-256: 0d1ba64f048aca995c37cc612c02a6c522c7e9cd6035804548aa93d634b6b85e