Malicious PDF — malware analysis report

Static analysis result for SHA-256 31616d6c42753d85…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 01:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca6eafa4ff04ce4ad6180f6a901d9bda SHA-1: f41908addbc92e2860239ae64c239ed19dc7fab4 SHA-256: 31616d6c42753d85357b8e71c2c2c972cc72f0dfc558177a94e3f121010a76ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rialta.ie/userfiles/files/givizu.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/f9du6cu7vuto6e9uh2egq0cfub/fopuxovajaditumod.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077641e1c358---pogibepitimanumotemusulu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bapizebi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072723e6583d---30027407823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608250c06f21e---salakume.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gudadulusekutem.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1df60e27d86f3579524172409a212a1f/rameguvusejipukubadawo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430222929387351810.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/48fce0ef2074a3192815abffa275f0ce/midimipazedawugidijivo.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/98870157640.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/17ij0pja3ni6n7ji047at73p78/bupawiro.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/dukulugezidefumovekutob.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e1d7457f---23522569427.pdfIn PDF document text
    • https://airbays.com/userfiles/file/fojofirusamixirutu.pdfIn PDF document text
    • http://aps-mes.com/files/file/tarivaxujimafujimizaluv.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/naxesoterudaraputalo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/92980883112.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/80e530f41caa7893c61162c9241f2649/56003019987.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/46336544860a2e4796f07e.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/nerosesel.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/nefikije.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8d44182f190d7281727e34177205ce82/32858446256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=volleyball+dynamic+warm+upPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7ba69860c2b38f06f0ee5cf8ad66ec03/5905629274.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 10820 bytes
SHA-256: 33718988c8ffdbc6aa865115c4a87cc7ede52676c963d4825062211cc80f0e8d
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 16960 bytes
SHA-256: 88d2c64df92dcaa2f8f679cbdd544ff57ff330f1918a8549ca8f1683d064f4b7
font_02_sfnt_off00012dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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