Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc5b212956d73f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 16:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d88e703ece4d9a23cf2b3b0435c008a0 SHA-1: 0428ac259bf4efaee0f56e7396bc6d5954713e5b SHA-256: b2bc5b212956d73f3349c95efd0f72b79554dcc204a2ec1bc4934abb09d111b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a085050d3a---25739623475.pdf In PDF document text
    • https://dalilak1.com/userfiles/file/ruxelavipononutana.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4bbd9e5fd---81352639857.pdfIn PDF document text
    • http://placc.info/up_image/98998291627.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c09118cc7d---buloxotovafun.pdfIn PDF document text
    • http://keramann.ru/uploads/files/gejexanepavezijozarade.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b20a05be380ce0a591990f1d5ac2b5b8/28179724845.pdfIn PDF document text
    • http://dhf-china.com/d/files/begeboben.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c398cf2b772---39459820865.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/liguxogudenebewinebiroj.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/24984705458.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759fc186fb9---jutelabexeke.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160f99c2c7cec6---40161902928.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/126907880060f3e334850f0.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/bidamevi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa10a7cd3---19190534512.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bvcm32tani7ne1fmo9avio9gjc/puzopatusoxu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11934487479.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p9erflpbdutddfolsdas05f445/mutubipabibuduxul.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606da347b6c90---gebetotovewurobis.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/vuwisivulifeba.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/52979118482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=co+active+coaching+model+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_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 17380 bytes
SHA-256: 3bc7b9871926274a47ce74833d6426593739c9aba1656192e466c3b703e2515f
font_01_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 10896 bytes
SHA-256: 6b85e299561502cf603d987f6ad851e6fd4b8e0d2db7a6003672936b4e1a88f9

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