Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4dddcd597fd4a1…

MALICIOUS

PDF

88.5 KB Created: 2021-07-13 17:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92d22853c17f421e0b92becd8905c165 SHA-1: 88332530e5b4866198fe8deb5646ded1c08862df SHA-256: 6c4dddcd597fd4a1ca43fa894df63487cce7a4ef1a8b73c5cf2b1fb6b5712119
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS upload storage and disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious sites, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6f21f292---59314171892.pdf In PDF document text
    • http://jarosi.hu/files/file/89553589164.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/19729326129.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/22983853825.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/toforubonerovafiserix.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/19lg1h9f9ptujdjd6khdcbmcbi/xojopupifukumofara.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8e3842a2---dilarumufadevededavevu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01a9ca1260---tinamitisajawa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fa159a577b5374e6d74a32f95806399b/31635024760.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/a04ejbtsc5l894j2vjl1v0ob55/jajaxulugokunoxazumumu.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/32748298996.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5bfae0c332c98b5b1ebb68075403dd5f/guvupodakoverixupi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a4754e0ca---lezobaregadun.pdfIn PDF document text
    • http://capital96.com/userfiles/file/solajodekudev.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a87b24710d3---93445576223.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fuzixevokured.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2ea8a3b03e219021ee7d317e0bac9bbf/33181491647.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0ca0ee2b---48948712125.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7eb870b4e---23948850703.pdfIn PDF document text
    • https://elektrona.cz/files/file/69666814455.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/xitajebonirilerowozugumiw.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc7d10d83---71086693942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lds+youth+sunday+school+manualPDF 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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 10480 bytes
SHA-256: 127cff76206856184d19e7d22a9633fd16e372d2fc14f11d09f64563b6c53dce
font_01_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 17100 bytes
SHA-256: 4ab6f00f5200b1a4814a0334763115431a1dcebeac1d38fd7db5e58ca06865c1

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