Malicious PDF — malware analysis report

Static analysis result for SHA-256 413594cb2e6df44e…

MALICIOUS

PDF

94.2 KB Created: 2021-07-31 11:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 225cc1b1dd84a0acbee727e7d1bb75e0 SHA-1: 32baae8534cc4de6c09157213f27dffddd5575d2 SHA-256: 413594cb2e6df44e761cac8f368cdb89feeb12b777d728033185b2b8e69acc41
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting. These links are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc7c0b3fd---ziwudiwapuweluvitus.pdf In PDF document text
    • http://jp-cable.com/d/files/xiruruzipi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c01f64975---xaxopodezi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079a1a1477---81734653725.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoxurigevenuwiginunaveta.pdfIn PDF document text
    • http://jump360.co/upload/files/20210713221211.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59f35f5ae---21095025898.pdfIn PDF document text
    • https://angkagenap.com/contents//files/laxigibamugeranupopovewe.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8217a74e60---ravojolizonuwemap.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740257b0bee---19433930748.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/vomurizegavatexojezukakop.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f8227368---pagurozanilanebumo.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/wuzewuzati.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xufizatamefovopuxitutaxi.pdfIn PDF document text
    • http://houselandia.ru/files/vasuwawijuxawamewogo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7afdf18a7---8537120056.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/daxubinilu.pdfIn PDF document text
    • https://jetaime-shop.com/files/70564154557.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3b57424444318abea7120985364ee5ec/siwodusisonuvodavugofobi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/fixetipesep.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af959e8c0fe---zubopuwutukefixulako.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/31325750735.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/gugakilumapugexezif.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/zivoz.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wukekibawaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=contents+of+a+dead+man%27s+pocket+study+guidePDF 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_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16788 bytes
SHA-256: 6bd94249d87069035be6619a0a7b49e3260fa1d6f5d91dd956eb80f738e63c2a
font_01_sfnt_off000135ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 11188 bytes
SHA-256: 4a4718a0a983e5ecd65d8e2ff26ac088b29f329a52ad90cab97b932b303c61e5