Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9f1f7db7d09ecc…

MALICIOUS

PDF

140.7 KB Created: 2021-06-25 22:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac641095160fe228c18fd8e063f04374 SHA-1: 30001428db3456021e191dd8170c08ffb9b45220 SHA-256: 6f9f1f7db7d09ecc62252151aa81f520d947bbbed23e4e9f5603149ca6ac3707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=the+word+philosophy+is+derived+from PDF link annotation
    • https://grandhotelbulgaria.com/userfiles/file/tewom.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8f506040d0956c8df492f9f346a52af5/5040244287.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/34e432012e749b8d8c73f5cfc28e4568/91469558619.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hokgs7j10mco78gmi1gn2r1p0j/43712273471.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/pamujesekekem.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1a8e914d0b92dbc6a9724fc5506ca971/zewasuwuvubamifepe.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9c33383c61a5adb2cddbd65f1e0df815/54532201396.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/76484959712.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h585c7ip417scqq1fn7pbrlft9/gozuromi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106251245538459.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/75317905192.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093fba3af330---mevebugula.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6608c98b66480cd282bb53b60c74afa0/7743969049.pdfIn PDF document text
    • http://web68s.com/upload/files/6077956451.pdfIn PDF document text
    • https://atl-50.com/files/file/46492871195.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/057ikdh5qbi49ll03ndf992qi7/12261380297.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210610081230580.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/16469357126.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7802e569---zavolodo.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0be63b691b188dd537c65f94fbbae7b4/64055369539.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/141c6bfa1a146f4cb324c2800a4be591/55672038454.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436b2efbab---18118944156.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_off0001bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFBE 20768 bytes
SHA-256: 504a5fea7962ac53c3a9d0df8a98d0f885cfed2d26dfdb3b97d491f445366acc
font_01_sfnt_off0001f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5AD 10628 bytes
SHA-256: d0ef778583f88c5b73db042115f1d7978fa7dfd435abb866849d433216cef1e6
font_02_sfnt_off00020e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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