Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a1c44024a4b301…

MALICIOUS

PDF

97.9 KB Created: 2021-09-10 02:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9bd87744f7e40b21436d5e2b68ac51c SHA-1: 4d948b672b056793d97324025d6f158a357dedfc SHA-256: d5a1c44024a4b301a6ab57cf4e9ca6f7bd6f24efd98794fcd1a53622f8eb3351
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://laborke.ru/uplcv?utm_term=can+we+convert+android+to+ios PDF link annotation
    • https://cooperspick.com/files/gotunepabelezanaxetesadum.pdfIn PDF document text
    • http://beijingteye.com/upload/files/24381539787.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/52893345081.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/tavirujokufex.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/50254874537.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lunimupetenuxipelev.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/fijinotug.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/nalodejasesoju.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/49665344317.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/49895998175.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/gunisesuluweju.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kajaxirexujojalon.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/guzumaregowiko.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/92702913944.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb0121322---xokuwikitejefifaba.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dazepoxomokodov.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sibidatopez.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/69264781964.pdfIn PDF document text
    • http://beiks.info/public/file/wekubar.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/1161599010.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/ruvijozu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1b9ed318---rirafusenunezisotu.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/rokiponagase.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a63b199234b2071b22f26d3730b8a944/zaseradodig.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/70847008327.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/jagifimoleno.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011928.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11928 17572 bytes
SHA-256: 4bd7f4279ca0c880edbfeb9d426a21d36ad3b318bc46f1c71bfbf231ff5e5cb2
font_00_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 17772 bytes
SHA-256: ce9fc55fa9ad4df66bd974d9ffa2576babeeaccfdfc059c4205ca8087c8b86fc
font_03_sfnt_off00016194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16194 10500 bytes
SHA-256: 934ca1bf1c0274c6e6d3a6940d748c6e8103cd14a2949a860ed0b7114c22cd9d

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