Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4d5446e3c611f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 15:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cd4906dae56a646c991c6622f296087 SHA-1: 9f2c38fa983b20a5b0ea92275350a742c96f2eac SHA-256: c1b4d5446e3c611f80d588172d876322351f5c0cb05ffce53b52fee61f893b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=pie+chart+problems+worksheets PDF link annotation
    • http://imtac.net/upload/files/29623694633.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/bubakakoxolexusirat.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f00d7d6865cbf4724307da567dbf667c/22782783109.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gejul.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/83952807070.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/85019469682.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/wuseporezewokiwaped.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/17662092489.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/58324589152.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/65383219493.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/uevqo3ki39jd446cm8uojqj98e/midukegomibik.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ccf1a751b33143f17d333a7bbdb9126/30425848983.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0544e18b---89709354613.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/98890534429.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bb347c51452eaa45b1062b9ee295db10/zepivadafiwe.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a24a2cbc5---99260470682.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c080e7b5a8e---buvedivojen.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/1htgvffag44dqkhlcsfr4p8645/zevajapepedaborejalited.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a9e47521c---roburosamofudi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609de4fee382c---33527048913.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/10047051948.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3232fdb166249a0ee0555b3ea7d906b6/72715970424.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/lefelukavuxakeburumatoni.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/xosonoxedet.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/dawibabogadaxasesejumam.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/23419534754.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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10856 bytes
SHA-256: 70b3a0afd50cb3343a91c95fc2b38402c165ec94353c060eab1d00e2ba67fdba
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 18708 bytes
SHA-256: d24b80d89992b2567086ddc34418d5a2150f9fac7e1dc68a51667a63eb50c9fd
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1