Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eac4410edd880c0…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 09:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9287a2280478faf750f12b3304a07640 SHA-1: da77816aecd9fc5c1b0ebcc8913fd38bd0791f70 SHA-256: 6eac4410edd880c02e19d1619daee0494d9ddbb39bd9d6fbd1b07124753b6f8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ambvet-trefontane.eu/userfiles/files/20865255279.pdf In PDF document text
    • https://rajatotogroup3.com/contents/files/vowejelijuruzurepas.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/nimadelimabelunawamoni.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/60687751077.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/39433926563.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dajunixutotivimid.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ef93b69080c70866f3d149ec671adc60/zutasosesajamugiboj.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1fbc6686---87974857202.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/repovarefutomi.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vupedexebuf.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/difovazagipaviwodile.pdfIn PDF document text
    • http://1carl.com/userfiles/file/74684249037.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161308cf15e17b---xanena.pdfIn PDF document text
    • http://jaqalsports.com/files/file/68482873098.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/bewofoxoxolekosesuze.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d26b64989---29030623273.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/vuronelebuwotenevijawo.pdfIn PDF document text
    • http://standardamulet.com/files/files/zabozivanuwiri.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/sitav.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/mifinosadivebepo.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/029048eb9defae5c14b8f37d3bb75264/7741664716.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34cc60e73---sulazapemelajapupomaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+best+software+for+androidPDF 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_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10596 bytes
SHA-256: 64a6349baaca88ec029747c6ee1fc8b346a33a6bdb06f8937c585a8e4e3c4ba8
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 17360 bytes
SHA-256: 6448bceceb9907f80a80e58cead72a7c44b226b40b15be5456e714db8a0f8fe2
font_02_sfnt_off00014d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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