Malicious PDF — malware analysis report

Static analysis result for SHA-256 913a2666fdba53fa…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 10:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb2f88403587279c15b4c62838af3e8c SHA-1: d7530d0a1ae1d900320bc93d7e2aafa0508b0380 SHA-256: 913a2666fdba53fa7af908c98c003b50556be5f6b90f96bfdb57188361898b80
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://synerhu.ru/uplcv?utm_term=tina+fey+bossypants+review PDF link annotation
    • https://newtop-eg.com/userfiles/file/vafijev.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qo9dsfdh9ui4obl71phaafnd50/78761976993.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/35479590603.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f2908760734d0a00a3f36aafef886926/xurojarirejo.pdfIn PDF document text
    • https://onlinendttraining.com/files/jimeziwakotizifarobemej.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wujepawedebadodaw.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fd081aea---xujoxulatopodarekotex.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6da5c781---binimusag.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/u6su43gk1th869sm2nbmnl703l/pumosetunakuk.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/xinavimoxugamidafol.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/82877214448.pdfIn PDF document text
    • http://chongros.com/userData/board/file/63627882345.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/72601766884.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/77321419417.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b590c7c246---49164435846.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210617_3D432D1167945C39.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/38102232110.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/6701009398.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/sateboxewoxazugef.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb3353a1f---pepexezitukufo.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/37983838710.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/86360851946.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dq47jjqbeut609pds8notnd5k7/98943462090.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215151214246254.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_off0000c5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A1 10672 bytes
SHA-256: 9290d2208e5b0736a93cfb3683d6484d6c3df530e2551fcfe582d9d319e0a070
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 17424 bytes
SHA-256: 1d09e4a065d3d3a039bb37c5ebd1f1450737ad1d1514c03034789ad67032016d

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