Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd2b07ce564cab…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 00:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42da2388f3c5fcd59552f4fce0cfa66a SHA-1: a6625d1674972150ac3f5efa0c3c7e0f09afc4f5 SHA-256: 28bd2b07ce564caba838ca29ee7fd0f1ba84d966f4cff9d65bfd6bc818ca4bb5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bmf1kene2c1electbh01t8vbt1/77583002927.pdf In PDF document text
    • http://drprdesaihospital.com/uploads/kubebaxuwabotawuger.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c1022823b9471fddd48222a49aa503be/morozidatavewejoso.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b643ce1e9---41407658047.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/71740491755.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/viwilosupepovur.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/pakeledasakepiwojabubuvi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rovawuvagotikagaxenapodar.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/58301117449.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/33882278509.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb008de3c8---vefidiratojezemomonuzeg.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e4091f9e2---47435414608.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vuzifekalukef.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tonigewus.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22033709747.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaff7473f5---gopuzodobumozit.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/tkakh1v4anleip7kqhoskpu1kt/ruxojalewixominaluzilivul.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec227ed7e8---82260835872.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/jurepuvevarodugogasoduv.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/12173289828.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2930d91e---bonenezitevumeb.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffba054349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shark+navigator+lift+away+deluxe+nv360+partsPDF 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_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16672 bytes
SHA-256: 4805a7703b0f28c6cf340a497bdd3465bd6ccc91b9e5ab4b6d42c90c2867ea56
font_01_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 11876 bytes
SHA-256: 5207580073a4594ce2703c8b722163fdb2e15c48f048590304fadcbaa8572a3b
font_02_sfnt_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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