Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5eb0e06d0f98fc…

MALICIOUS

PDF

85.1 KB Created: 2021-07-18 15:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c74ccaf1aca68f1d1d12ca0ae9387ac7 SHA-1: f76d566e285ea75d5242f7e3b63ed73bf1831a39 SHA-256: aa5eb0e06d0f98fc7b31899a4fca1a889a40434e560aa80e1964d55865a96a3d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The document body is unreadable, but the heuristic firings clearly point to a link farm designed for malicious redirection.

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://mai-colle.jp/userfiles/file/letoviri.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/ginireliwisepi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7cb9e520bb2ee99192bb3f961ff4f3ee/36329322649.pdfIn PDF document text
    • http://npas.ru/pic/file/24675884727.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0e971c37961845e34f46f4a774d21532/29058992839.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/46804159033.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/95a40e7abb8c6aa78de540e94641eb98/26727612829.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/25ac4dd8329f5a91a95f6f1386be0682/73180315627.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gemimaxelezujusilovuxopa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84214da33a---5046877500.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babaf302a3b---95891794944.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4156c15d---lesizidebeki.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/donapuvedemulakezin.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/65262243262.pdfIn PDF document text
    • http://iwishop.hu/file/nolojunamebi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7114282f53---rediboj.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1a86ae8b---98413682294.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564bbaf1ad---79412817158.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa00a972df---tikolejexopomezulera.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/97730034132.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9m4jq4uvrc8ku1tvlc58vh9dun/44347785524.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/jovanirupuxedulimizupu.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106201441465717.pdfIn PDF document text
    • http://24cvety.ru/upload/files/jefugisuki.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884fb9bcfe4---migexuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+vs+automatic+transmission+which+is+betterPDF 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_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 17900 bytes
SHA-256: 4d38ce5bd8c92fb2241eadbfe947887a29cafe457db06c7b59fa767eaca903af
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 10880 bytes
SHA-256: 985bce4bfa6d3f4095807b1abdb8934c4743d08fa653db41d6039bbc1763fbde

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