Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad42b696d715dc9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 18:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c52818489981acfcbb9cb2644635c862 SHA-1: d5d0e6ea99ef442fb458a0dea0b037b3551c07f3 SHA-256: 7ad42b696d715dc9ab102bf632256e42920428d46478f77e0845bed71429f56b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d55aa518d2b21288ee38121b5d44122a/46074759185.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b7c9b1acf---25792453042.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/79336137749.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/aa6d2b5e7a1dd17ccbff3b0ae33c88b7/73653932192.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/nukawezizapenotuladukofo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ff410e5f295---86516496040.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wevulujulovapedurevu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/94c0fd33c7334627385aac355ff0be65/61275940313.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6835d5ef---7906148298.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/63077920738.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/oe808pqq2rs5tatsm301ikdjcj/71575630426.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b38973a64---45134501609.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/15265942806.pdfIn PDF document text
    • http://topp.pl/_topp/file/28326324954.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/dd74f6804c52b92efbb9acc6f34419cf/pozitoru.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2a873def2dcbc230f0b20d6f41b17b87/farabetoponobopaji.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c016e6e374f0d402bdb278976aa6a13d/75289699381.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/18074756724.pdfIn PDF document text
    • http://pasaru.com/upload/files/popakedunutenenatise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=solar+photovoltaic+power+plant+project+report+pdfPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/ralevebunodisi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e9a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9A4 18160 bytes
SHA-256: 02f643b4ce1bae89524d505af8eafdfb3e073d73b10ee9108b687431ce0d0d85
font_00_sfnt_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 10904 bytes
SHA-256: 393e964a7908e642cd213b78473f430598f4067cb8dc2ee5a50b3fed7fd96588
font_03_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 17276 bytes
SHA-256: b77ea81725f64525f4d87298f412cae33b20eb3b4d71b7e2b0b83fc97fa24978

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