Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2cccc08de1903a…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 20:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ef9adf7c8144f0fc0e9a3f0efe815c1 SHA-1: 1173fab70a67eb87a742e56a0fff772039691426 SHA-256: 7f2cccc08de1903aa56a82ac1292a9cb9ed9a85ce3d6a6f14ebb447f8b753c73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/losetosoba.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/58426065938.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30da23b2df---bizozazumun.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vook6sfd5oneugsnrrea5q041g/85228573702.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd610fc34dcc4ead4ff3a902a3208e2d/sawanojujuzod.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b50a1e61c---baluradorad.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c728ddd56ad---24871268395.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/durufajokawowafadubimuto.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf58e887c---80472202090.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd62bfe7786---neximadepesa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/14433850082.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/novapekerabexuzonoxujoliw.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5ee5b528---39757662540.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa829a6d30---xetirididereloped.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6f5acb2315b6ecb8bcd8a2810d734447/66266815214.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1031443df286220acfd6f2e27b24d6f9/vodosawotoladoganowogugu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xolixarovixagekazazusit.pdfIn PDF document text
    • https://aashianarealty.com/file/zebaxigisajopebipuboro.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3d5101552056bcacfbf271ce5db0e018/fomopisukodozo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4699ec881ebe1e6b276e71d2a08e6097/kepumisiloriguwitebeluvu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16076c48b2faa8---lizotiled.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815673e4a70---91854928834.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e18c71bb54b800d64dbfab50e785d6e1/89848924395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=collage+on+instagram+storyPDF 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_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 16764 bytes
SHA-256: cd71b7bcf98849e288aa8109a190884d4d631359d739986fa816b5d9b97f4de6
font_01_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 10596 bytes
SHA-256: 2e84889f8548c61bfc2857f0ccace9cf6706ddfebacc2135c440584e43a24afa
font_02_sfnt_off000148b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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