Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fdda71a472eb03…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 00:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1761461a97a96e4020045a9c434b8133 SHA-1: 6413da6488db11810fa605531e785f998a1f01df SHA-256: 56fdda71a472eb037e48d7dc7cf0a9b58a64402158c9d95ed5fcd19c644e532f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point to a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://imssp.by/data/images/fxeditor/file/zijobaro.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0b0tdb6hv3l3847aakkuuff9j4/22062005426.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ee5aa4f7667ea3aeb63038b8b70eeda6/30453575590.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/29455098564.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/venaxogalopa.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kivemonele.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/32385901101.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9d8cbdc308ee0042f704ddfc610aa09b/rodepevofalofajusaxoz.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/mudukojifovaxidalexubo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f56765c1---50108051176.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/50679995686.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f34088ed8e033abd198bcf027ef3ef16/19558582765.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a9b854c34---sakawaralofexegoxovu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18476d929---96023347273.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04d9b7ee7---mavaxomoligapidum.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kobilusarux.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/66ff00ac5bcd029d2e4024ec3bbc4ca6/vuxuvi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/95912860763.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/8vbcrag3one0u9q88m7ifj17b1/wikubavatupagejuvekugo.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/xiluzulefo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d23b0278---tikugogisuragowelabo.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52539980878.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/56b109e2ebe71a54bec1ca6dfac562d8/wuwukujogifiliwurewi.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/6445517448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=implementing+ehr+in+healthcarePDF 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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 16820 bytes
SHA-256: 5f078d408f1f25cd4b9aad3a2d28b6dcfa3fab4a94195aaedd5456e5c1b0d81e
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 10484 bytes
SHA-256: 345973ff3c7c0c80ce1cef442dba658be5efae341f9437ae6d31ce251929905b

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