Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced86a0ed906b608…

MALICIOUS

PDF

81.6 KB Created: 2021-06-27 08:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d4716377ff59997d980b7dab3aa9975 SHA-1: 9ddbdb855ccb937e8068b0904747ca1e6f9d8b47 SHA-256: ced86a0ed906b608805e98f83b8512b2ab700c9db3842f972639672acae0c047
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs, many of which point to compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f2b49b9cece2405837879582943a1ea3/68902407894.pdf In PDF document text
    • http://gesundimjob.at/images/content/files/mozowegefitinituj.pdfIn PDF document text
    • http://4bx.pl/public/file/88057330292.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/22330602441.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b71023d---5156818143.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/60630649545.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/99813248135.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021530453233504.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nan7guf3t345o02p94gs8go15i/92706247611.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/merewalamanaxog.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/i82bpl7qqdvrn5t3g6287r8hn2/sobojokalud.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf18df1256---86544813623.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56e76e23e---tegirovokogagonezonef.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6316e44d8cf5fe4660bda50189859934/gigawikemobux.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/25168480341.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094272e350dd---2206114457.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/derenizepilixeviluronibi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c0fb1be7---kavijoj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606daf7aa8b9c---61510189069.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/082205078571.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082920b3427a---8279395908.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e69b4f724---17903809953.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/25954887446.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/njeqloud6dobs7at1q3ukmsnnr/69708565734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=great+oxygenation+eventPDF 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10392 bytes
SHA-256: 62c0551c20baf0ca379c074f8c084bae3038911e59cdbd02d0ea742428ab803a
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17768 bytes
SHA-256: 765ae04d623245a1bcfa393a3365b9755fa60d7b901c9aeefbdf42c17ad796c4