Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a37e9324aef0cdc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-14 02:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 647a50da6c01c3c8406b055f48ae2321 SHA-1: 095271089123fd0d6d376722ffe490630a36f1c7 SHA-256: 3a37e9324aef0cdc50814dea0f345eab56ea5f90a6a2cccebcc7079ffe434193
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ei-windykacja.pl/upload/file/jevafufusimam.pdf In PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/75912702266.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/simugofi.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wudozuwirukuxarewiveliku.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/13148570621.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/mubasibopoji.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/16329272592.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wobiv.pdfIn PDF document text
    • http://afslab.asia/upload/files/72546151526.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/rifazorawuz.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zabujufopobapisebe.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/73538131374.pdfIn PDF document text
    • http://kme-kme.cz/files/file/77145576116.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132687b54a83---dojukijuw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca7e9fb26d2838bd27d81512327ec567/duwezukoruvusevuxikedivuw.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030648251899.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/38104021559.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/3831452755.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e52c278a4---79924034597.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903114917.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090414534740.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceeb511e0---mipadunewukuxegedex.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec685d1143---37126609016.pdfIn PDF document text
    • http://195exim.com/datas/files/49338898990.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/palonapivazarezu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/94773371517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=antutu+pro+apkPDF 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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 15400 bytes
SHA-256: 80b0b20bb4b532e3d9159b64d7cbf79357e5782949ad1f6e3367601637956e8b
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 9980 bytes
SHA-256: 731ff31ee5c92c30ec85c6e6d4ba35f00b851b61989567b1a9903fe5fa258184
font_02_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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