Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d742763ce97991…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 02:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e063f80154da76c7f624e4d34c31f8e SHA-1: 47252d1bcc91fe7942d620f474d583b7f320f653 SHA-256: 32d742763ce9799147aca3e01147f0479343be6e9fdbb5b318af089462a03423
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs and a link to a compromised WordPress upload storage further supports its malicious intent.

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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/le7ecsr9ar29n1c0qcnfao56tk/55671576338.pdf In PDF document text
    • https://cingenito.ca/upload/editor/file/8105893177.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/626176190.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/27697350373.pdfIn PDF document text
    • http://4rrecycle.com/files/file/45808387322.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/pewulog.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/ximavebipiwevuxuxovivati.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/lalagudopawivavakixifuker.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/98221186491.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/18574614845.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/nejafotit.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f692e86---gerufexijoduluze.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/juwiwizorubuninekate.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/57974654711.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/natewevagagagexirabek.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/05ff291f8ccfd15aa20e2d75bac1ef6e/17506471172.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/nutobosivupoliwabujimeti.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/pavilipowabasufebosog.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/wogudaku.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/tinodaxolupunuwatotoxinum.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/xivawuzaw.pdfIn PDF document text
    • https://hiroyoung.com/data/files/tazeligibimipajoxa.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/351327451.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/zatiluzusagalerizetoke.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/17070010394.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/gewubesivilevewenatetuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+millionaire+mind+pdfPDF 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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10460 bytes
SHA-256: f6d110f8dc0b3182c4afef02da3612163a9568b0b69fb18f22a327beb676bf2e
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 17964 bytes
SHA-256: a91e468a9bab8701f30c6662a6f716ed96f1121a28648193237e29d4d6a7e603

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