Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1b69a8f896e5af…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 11:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f009f3ae85d7c1c715ab081c7ec3948 SHA-1: 9c793c7db7e62c50a5e3301ba7d572be049c395c SHA-256: fb1b69a8f896e5afaf1e5beead651863cb9cd8cb570af0725a49132716f6f7f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The presence of numerous external links, including those pointing to compromised WordPress uploads and link farms on disposable hosting, strongly indicates a phishing or redirection scheme to distribute further payloads or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grootformaatspandoeken.nl/userfiles/file/59747722970.pdf In PDF document text
    • https://tonymusic.se/UserFiles/files/77720055405.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/55854945752.pdfIn PDF document text
    • https://duythanhsd.webthoidai.com/img-dn/files/sedibasiz.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/51817398300.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/xupekumisak.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lr4lf5rk9de0ugo2623540ar2m/77207079715.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/bijewado.pdfIn PDF document text
    • http://citranco.com/users/files/98617458344.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/de7abb1105e31fec55743042522375ca/lokuxebasarisiwanoja.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7872625d4f51f9b7ff6e4c495329de7e/86089919926.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/92767601282.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a81856ce5cf8fa56fa70c10d917c53e/61443693889.pdfIn PDF document text
    • https://combrooncom.com/contents/files/nilujurix.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8b452a6d---60531352132.pdfIn PDF document text
    • http://dasbluemchen.com/1887732956.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/popujon.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e63937e4b184787e416a2cea36c768b2/sefuwevadajowatewafamer.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/sezezufamuwegoda.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/54496339050.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/zekategekikagujipobavu.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/94359853633.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/80240372804.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/26049469356.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/49858948469.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xuwigiguzilajidonizoluzal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=jailbreak+roblox+codesPDF 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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 19068 bytes
SHA-256: 89e550e653e4b2f76c48b7a5eb8c2593b75fea5af9d9faffb74aa6598f980775
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10484 bytes
SHA-256: 4c788c5a25238d5b6d014e62a98f44ecfb184ad92b7df98b8fb0b68115e27c78
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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