Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6f53731558c7cf…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 00:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a3f3ae286b9782a3885d90aad425ba6 SHA-1: 21f83cf59d0f8955b77a086df3723c9d4707bbb0 SHA-256: 3a6f53731558c7cf59ba421c0c579bff88bc60fd7daee500528ebf1258d0dbab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of an IP literal in a URI further indicates suspicious activity. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8873b972a1117eda87a61743e2b005a8/47236524249.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c925396b0---tepexazarisisokefepubofuj.pdfPDF link annotation
    • http://rungrawin-itt.com/userfiles/files/27302830461.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/51949530287.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/r602jh9p3nerprq150do9esti1/xemazufan.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae816f0ce5---54853357643.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/ferig.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea34a5f48---31669498367.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9efdbdd52---43306481253.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d1c44d781---bowoxe.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cda60c69814cbef346b72ce40dfd5f23/59195915090.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/270ba27f300b891db22f1b5831b3c4ce/zonofanemovavupuvi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/74964900848.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/daminidotudujutewapotege.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/bewikuzefuxux.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105200805.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m4g4jcaqhnkfi8mnqk14rt58cq/tupovetijom.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bijuvupep.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tiwevanafexubetizurefure.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6vtpmcklpaqgs0sek8eistr9c4/zuref.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fusagigexujakaputi.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/55324560342.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ef7uu9eglbv305cn4obgoht1e4/wizuzitukusajege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=drive+conference+2020PDF 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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 17648 bytes
SHA-256: c25603d7fa3f0c3f4ea6d410f46238e444cbdc8eb8d17edf0194665664b4a4d8
font_02_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 10164 bytes
SHA-256: 1977ca929eacb31037ce9d34760884182f1025b6759f28c37db49ef6a730ffcc

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