Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f8cec03c50b3a3…

MALICIOUS

PDF

80.7 KB Created: 2021-07-22 14:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9de8534785ac7ff3b16078781ff7158d SHA-1: d82eb6b029b96cb4db5896bc7d32391c2c33c174 SHA-256: 14f8cec03c50b3a3e85675622274273de0052bdcc2997726bd045beaba66fb92
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, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andrelandberg.com/userfiles/file/25087518618.pdf
    • https://a2designbg.com/userfiles/file/nubogigiduxogerel.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dde85413f---77454684872.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/me85gvoemnvdbcjo0937ojg1o5/pakifufazixofodeki.pdf
    • http://rc-modeller.se/images/file///sigasazoleg.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a3268bccf38d38168b76f31356c763ea/8889392696.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160822df452d4b---zabap.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a966b22c77---kofokaruniporurum.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/7ebsb0gjss5n4u7vcq3g5i55rl/53845127776.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb487d350d---gumukegokosijonovu.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vedamizovidune.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2adf5a218aa442d93e732902975433dd/mapenikimosogutijuxawu.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9jqd668mvkbo1npgds2sauu0te/ridutifudevewovupu.pdf
    • http://dahchen.tw/userfiles/files/zesowewog.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db77eef7fc---35308152880.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/a12ce9fcf0885b003ed2b20d01296586/91352453166.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/wojovedomituninire.pdf
    • http://01host.ru/userfiles/files/jepedukubomi.pdf
    • https://ringid.vn/ckfinder/userfiles/files/5589409423.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ccc8h3a0futajcc93iac5mtcg3/47077724474.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded9b9d4b3f---zoxujifobobike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jon+duckett+web+design+with+html+css+javascript+and+jquery+set+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 16792 bytes
font_01_sfnt_off0000e7dc.bin
07d7b8459ed43895417f4ee858efa76348589ee75b5fc906cff6f1d2a851e132
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 11932 bytes
font_02_sfnt_off000103a8.bin
ad6315830685ef753af35168fafc3c8b0374a0ca3569437e5060d1947b8f8f45
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 18184 bytes