Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04e14528b82a775…

MALICIOUS

PDF

75.7 KB Created: 2021-08-14 11:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bca66d4e9bd2e8564286acfa51d96695 SHA-1: 6c3240ac96652e346baec3d5e3c776b4f2593080 SHA-256: d04e14528b82a775ad355ec32700a4b5154a1bdd71d03f69f0a8c697a2beeeba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedc7cb46f---35199672157.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5ap5vuv12qk1pnq0d7k9piom7n/7237820403.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/96711199681.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807d3a8fab0---tufonozufogeluje.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/63048190419.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/tiluwobima.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/minulobinol.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809f449d0fa---14428263172.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/22514390174.pdfIn PDF document text
    • http://schokobrunnen.com/idata/baleduvumanedopunuzabeb.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5fr5qjol21r6h0hi504iuvpmt4/39533426201.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/97412252120.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/jubiritabami.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/90997385029.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/lbacfu0l8645lh877si5sdlpjn/51646269625.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e076438a3---48223422727.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f7b6b537d50ec73b2b0b2bd31ce75033/90439796693.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/98545041737.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bc52cadbeba---98816355425.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/qs6n3s5lvndsktdkrc4cktuma4/84704747482.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4def9a37c6---muzirub.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/31395574633.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a71f5df32a---gukelomad.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tejomupil.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5271f6c4---11046203014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+pair+my+jbl+2.1+soundbar+to+my+subwooferPDF 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_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 16656 bytes
SHA-256: 5d161c4c1d28a166519d941f89933165c8b5d131eb1a48259dad07f7c8a49a77
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 11460 bytes
SHA-256: 121c5c4327fc88d6438214d3e8c1a9aab844ab69297f02b55bbde0c46c56854a
font_02_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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