Malicious PDF — malware analysis report

Static analysis result for SHA-256 371ffda66ab3ff56…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 05:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03b743f265518de3ef0a9e3387bb5a02 SHA-1: 7d4756ec510a8eab960bc62955d4197f4330879e SHA-256: 371ffda66ab3ff566b4d094655179a708fb4046158fec39c0980c198dbdf70a4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+screenshot+a+snap+without+the+person+knowing PDF link annotation
    • http://stlnsk.ru/uploads/file/fopekisop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c5399b70---41569085636.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/91017052616.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/folewipo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2c5f3eddfcccd5dc0a82d1ca590bbb3d/9231321599.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tapafigudipesuno.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaa9aab2b---59147152393.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/sawolegitulo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/m6ns6k5vt539l66erdik7f4gm6/42583423.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4362be121---75377370748.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4792d760---27826511225.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/47744903340.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/31394226274.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/50586947558.pdfIn PDF document text
    • http://arablift.net/userfiles/file/bokuxoku.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac0229422---gekijaridog.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb6612786---51345175720.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/92523469367.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/famavarojibajopopemomama.pdfIn PDF document text
    • http://opersan.com/file/41154798097.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/65711044116.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/47591320338.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/21iom881coqbdtpgccjhuv1lbc/xukira.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/79288692335.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/xujezu.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 17344 bytes
SHA-256: 8f17214bd5a18fe9858fcbfa38c90faef4ec57eea5e6d52f927a66163222f850
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10876 bytes
SHA-256: 4939674b7c18c5fe3c61c5f4adab3cd0c92968ce72c05cc297cef375a0bbd9c1
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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