Malicious PDF — malware analysis report

Static analysis result for SHA-256 29767fa46d43af7f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 08:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90af0b1a448a63e1542b0bd32e4bc2de SHA-1: 9b0975588de9494fe7adcacc2aa1966a06a117d5 SHA-256: 29767fa46d43af7f9a74573888e541fb38c8cbe908cb24ee380cd1ecb7d3cea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple link farm heuristics suggests a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=acute+red+eye PDF link annotation
    • http://www.centralperdana.com/file/15836876164.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvuxipu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/7488271757.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf408473---serojefaxijex.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/94074792406.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/20875771333.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/nokulasawuda.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_095429.pdfIn PDF document text
    • http://jainfarms.com/uploads/fogepisi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366709d345f---55871807385.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/85mbj2ued9jlslg9usm4u0ok1k/gegarux.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/41510750597.pdfIn PDF document text
    • http://client.diffuse.info/files/46501473165.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/onlntbjdbf64fpisf29sj1v3j6/nudideguzetemalofomonu.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/30133146308.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/vukaso.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76014707925.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/91729035498.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/53744585440.pdfIn PDF document text
    • http://sakem.org/userfiles/files/namaxuwuwevi.pdfIn PDF document text
    • http://maribon.net/app/webroot/files/userfiles/files/neweru.pdfIn PDF document text
    • https://heyratacademy.ir/file/73023145206.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gupekaranimefekafajojupi.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/fulipodamigeruga.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/mokavawefonusog.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378f8478a42---finugumisekefazit.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 17516 bytes
SHA-256: ec35e63664c98cd36ef130a2dc24f7c49aacd404a5761e1c42350d1246d64747
font_01_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 9868 bytes
SHA-256: df9c583ba2db52b01ce9240c0eabfdee62ae9dfd41a9b9d2533c34d78e2ec3c9
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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