Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd8a087a1fd184d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 23:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bedf0aac295ecafc034bbe9ec4d0ebf SHA-1: 04f66fdf2f6ba10ebce0c24c0ef5229508a2b10d SHA-256: 3dd8a087a1fd184d9a5ba2a1b670641e801a06d9e8b66a9ef554a8c333303bdb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=jingle+bells+jazz+chords+pdf PDF link annotation
    • https://fwullong.com/upfiles/editor/files/12534828379.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a991f6888a2---43363737118.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a580b65916ba74d4688e05f95cea04ba/35384443953.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/takidabo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7e4cf1867---bopazatadavexokuguz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118551588deb---61172104840.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/42943557048.pdfIn PDF document text
    • http://video-cycling.de/files/file/5766486660.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jupoxukenesoxisagufutida.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/ferinefugubekeradolabagi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7a9711746b76b14c14f55d59b2e9887b/84352365527.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08450da2e8---fubikoxisuzumamal.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wekol.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/jakiberap.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c28d62014---fuxulevajakebu.pdfIn PDF document text
    • http://teknis.it/userfiles/files/farifibinowi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b526d109---vimimusegovanerejuguxeje.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d99b6a05---1876311819.pdfIn PDF document text
    • http://thongthien.vn/upload/files/37851982640.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/44650136653.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/varudofufejajuralesefos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2062c9b8d---togom.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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 11124 bytes
SHA-256: aeda0f03ae6703d1098d390d3583a9103bd61e8f34239f4dda7fdd534c502f83
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 18512 bytes
SHA-256: 0ecbefb06390c07f2ce7c648080bc54acb4e9e7fd6e01f60e4294f59fc8555ed

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