Malicious PDF — malware analysis report

Static analysis result for SHA-256 203aec483092527a…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 19:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a43b145a7a91c3732468dbf61ad869e8 SHA-1: 4658a931dfb85634d1aa1db44ddf5c58c973c679 SHA-256: 203aec483092527adcd33989a6d094c725774f0fe8b72b96bcf9bde9536a2359
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mn02rpb77lc9dskciieekrk913/fotupukukefozamujidalipot.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160804fb457d4c---52529120382.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3ab29a8448e936b66db66ab37b150bad/61573358137.pdfIn PDF document text
    • https://btegypt.com/file/86064103062.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fbc6f02064a15cdcf36676cc7acb3578/musotezusovad.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160706342d5728---7110484259.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2271a204---kakimopumasibig.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nuniwu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ebbe77b9---porixuresolitibinujupa.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/88fb75c090ed5908eab57dbe953bdb7b/92859321836.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/22106301817.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/phrn1rk3p4i707qoa70qc616ba/titalo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d6a0562689dddf4400931eeb24005609/selunijen.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe6417db8---bomitu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/561d26a3ad4e23927498e3e6560bcec3/nerugafelolel.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5aa7bc91---43097411479.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f78c5d2b---64204681650.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/31425431550.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5d086747---29897501021.pdfIn PDF document text
    • http://kbchina.de/upload/51181662534.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/26467860687.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/366177158.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3e552bf002d2de672c5ce7e418770f0b/97304859228.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/ramegulekeri.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/gogugibonojawofimova.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/semopivekomowufarifaburux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920192700b6---kidijus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stop+light+meaningsPDF 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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 10672 bytes
SHA-256: 08e186dc19d581ef3dae18659f31be5d5230acdabb6569b31c298116d9836b5a
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16784 bytes
SHA-256: 28ef3e82aae65b9fdb0631b840cbe094b2e3f7d818de88ba1ec9a86cb23ad1d1
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1