Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d854e787d6248c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-10 09:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21ae426aedbc280b22d992f75e696117 SHA-1: 6a333ad46362e8f8d105e6e6f9c2c44592056b99 SHA-256: 27d854e787d6248cb6dc2b6c63400c2aca20a61fbb6fd56de7080b1dbf5a8e2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the intent to trick users into downloading files. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=gta+san+andreas+hack+apk+para+pc PDF link annotation
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/riledo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904a549302f---gutumaleli.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0c630cea---dirafaxi.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/23787239099.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/21573219381.pdfIn PDF document text
    • http://ipublicity.cz/data/file/murajumemegu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/61812224148.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b559e24e73---66466659545.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db82ed91fd---40942465524.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b472bc6dfc0---27201020432.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cb90af759fbb2f410ed03b13e9b6090e/famolebapukesagafopo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/389258512818fd8f527a2a1d7dcd09a0/wiwag.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/65358989231.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4c2c01f2---vutabobuluvugapanakediso.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/faketokoxiw.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/r5ts7c24i77q020rt53jaodunh/lifit.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/18430084709.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/85525669904.pdfIn PDF document text
    • http://russia-ex.com/36764830369.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/kelevozemajatigosizikizu.pdfIn PDF document text
    • http://alltechsro.cz/files/46773505567.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kezakexedusubapoxi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e90c237d2b5feb58cc69b8a6928eae4e/14883729978.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d2d5a51286bf3359d8e8232f0a78a935/9558483154.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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 17780 bytes
SHA-256: b7dad8aefde84f7681eaf4139cb730136861bfa21b044920ec31c7f9dcf7d57a
font_01_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 10484 bytes
SHA-256: 02469926977715605ae1bf5d119c227d68898390d9494d34d32e744f362eb55e

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