Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd09e90831153a8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 16:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f534e12e31d4a9cd4914f6fea5ee27c5 SHA-1: 6c06c3e9614bc63769678b2fdc5c50a4556ea8bc SHA-256: cdd09e90831153a8da38aa55cbe78514292dd447d9e55f2c78934832566b8cfe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress sites and other domains, likely for phishing or malware delivery. The embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=medical+lab+technology+books+pdf PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p8ku4a2srhtko8tcev9mmg3d87/remujujorileluxi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/zakivovawabina.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/24117636234.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818912bf90b---piwobuvobejalumu.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/942294713.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9bece399---86711723373.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/tesaz.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18468fcdd---xivulewatibukejudekinu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6636426a38---danomodozu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pvmf79n6f39eoh91n0bfqti2v6/60432683157.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/44231222680.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c639b695---38205817252.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/bogojajosojuturo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15013c98e---96846481380.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/9476906979.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd188ca01c2---73705360083.pdfIn PDF document text
    • https://x-software.cz/data/file/36854386821.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ddf5ffcd8b15ec1d3afface71e6c9dac/sakanojixovewor.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237cb3d2a3b---jezafiviludosefadixup.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18620135701.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/lokegupedeluxiwuxe.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/12squjvm8uroe6e0d53tdcb2aq/gugerenogikinaluxiwiram.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/38977856359.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e23378d79cd7ab7ea2492fdd11dfd188/6692562193.pdfIn PDF document text
    • 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_off0000c184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC184 11140 bytes
SHA-256: eb58ce8df6ad59e2c1f93045149b09970163ebed0df8f079c385e90d70c0b486
font_01_sfnt_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16180 bytes
SHA-256: 47ff3fe3adb938c00e7ca7dcbd9fbbe04448438d21ba120a905697938c8ea0d1

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