Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acf9d38a8fd8c29…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 05:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7dfda881ba745811622cc54cd7a94430 SHA-1: ce4f50f5df01f1470e720580f4c16f7692e82304 SHA-256: 2acf9d38a8fd8c29fd1dfcae8eacc7fb282868332cf90ceccb65e718dd34c75c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab89387c---foxorimagovudajipota.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/75805678947.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ui7aqc17vfieff9bcti8nm8sq6/96865136666.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7572496ce6d999c459bc26207c578336/55542961322.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/60443540508.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/diluwiluxidabame.pdfIn PDF document text
    • http://effektfilm.de/files/file/33159638746.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210819193355.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/94071774444.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/919342052406cd363b923e5d2a15a6a9/35682424400.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b83bb00f061---befisodigik.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tozudogawa.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/h7rtgh14tip007aur5aq6h89k2/10127063135.pdfIn PDF document text
    • http://jaika.in/images/documents/files/788878305.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/41784902149.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/e1271048f9069c007a205a958d99c46f/16788411085.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210819045449.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b431ac702---72294932504.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078397ce38f9---11375049962.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/mifirepilabaroxino.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/60bde6ab7327a438f1c8159850b16201/dokabelukagadagurodaw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/faputuwev.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/34856192222.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/soravomevusegusevukit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tm+unli+call+and+text+promo+for+30+daysPDF 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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 11356 bytes
SHA-256: 172a338868e1cdad9043d4c9d65fa44fa78524c3abf20cbc9c590c5f85104f94
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 19336 bytes
SHA-256: e82c6a7be220010926884504920759b5e20f96942d0527ebe3044290dd4cf3e7