Malicious PDF — malware analysis report

Static analysis result for SHA-256 6941e87d9d9f4f62…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 17:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f3a3497e7cd10d10e5bdbd1593ad80e SHA-1: 9b3404d178b70a64d3d8750595a29d085daacb8e SHA-256: 6941e87d9d9f4f62cf2a490c55faa67d3206e29ae420e04471d908830026003a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=business+ethics+manuel+g+velasquez+pdf PDF link annotation
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/651650c7cb94fd78790ffaa23af8057b/78463735915.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158239768c---moboz.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/gozupifede.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/83266558098.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/papowoji.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0a7e5ce3e477ff34bc030908104bade9/64201768306.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59f86eecb---gawimajumizipana.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc32e9a141---98926227784.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69917f7c0967deadba82c3e964a9d786/22667093844.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/86878901342.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-30/20210730011524185507.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ika68l980665tuiboqtbue2rlr/dagaxuvarun.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/87370039240.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/mamegokatoteze.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccca121a95d---63762889394.pdfIn PDF document text
    • http://weingut-suppan.at/files/zubosalanutijabifonofod.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3966e0a8b1aad44d559aea7f0359fd84/birof.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/nimegolopotapugofizusifo.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/64421924308.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f09ead75c01295b25e0b46e3d63acb8d/51581809007.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5a719f7be---kapexamu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/titaxiwezemugarijixevul.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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 11272 bytes
SHA-256: 103dd309766cf10c682392e57d46dbc2d36383c930321c401d2743472e74846a
font_02_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 17464 bytes
SHA-256: bd0eb820abc9aba5f084bae615b667d41525927c8a9292a9ae125bf1535c5d3d

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