Malicious PDF — malware analysis report

Static analysis result for SHA-256 539700dfcd99366c…

MALICIOUS

PDF

78.0 KB Created: 2021-07-05 21:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 823b32295b7c185a9e9de6cc1223c6cf SHA-1: 90c5cbd3e1de6b86b8006a23a5be48f44714dcce SHA-256: 539700dfcd99366c339e5e6c09d818be0e7926e6d44a20f34ee27cad98d88512
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external resources. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://classconnbio.com/img-jacson/files/36687004775.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8766a6dc92---bufewikikomotape.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/91128789036.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/91038482058.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/82738933157.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/14731142920.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wogemufapuzosonima.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/46952849205.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/v7i282adjv74apv28ik7sfn9o3/146800153.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce6f775bf---jogekudojozilefi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d233d4942---mujan.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4plk9ivg6dfeso5mh28vpbfme5/53044828501.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6c3962233---32930424631.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zatudefebidugavunapenix.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/a000be414fb83ace1b3abc2cf044f689/dozobudi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/97263653719.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kevizadawogiwides.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094e7e27ff76---medanos.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/93968812743.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/tozenexuzidifexebimir.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/79969fb62cbb68ab53a914ce1b457942.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/baxuw.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/329d75dad6c9caa0b094d9e8f542894c/48992482632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=108+inch+lbs+to+ft+lbsPDF 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_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 10464 bytes
SHA-256: acb7aa3ec924d9886a2dd3a4acccb691a56aaf28d4c4e3cda9d4df0bc4275571
font_01_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 17168 bytes
SHA-256: a3499cef9d3096ae55f5efbe36f2a5b005eeb5a68ecf8ba6571b8f5334afca49

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