Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ce53a92aff4303…

MALICIOUS

PDF

125.0 KB Created: 2021-07-24 12:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0df5ae5613bcba7eafd6c7ae8661f88 SHA-1: 26beb94888f4bf4665f08689b110eb2e8aa371d7 SHA-256: f8ce53a92aff4303c722f3255329f7242331231d6fdce277b9526acaa65cd621
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9812

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dfc87541093a0387842a3e66a8d46112/73894885265.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099073eeb798---92125779541.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb405ad75---71011547956.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160add4ad476f8---4607253173.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/makelobitenujutajijamesu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/15990315028.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fb2e1b12644ea5a1ba929463820454a9/suzoxiki.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072984a53088---73900735029.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d024d90071f---78909604219.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/noliwosadugu.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/pikuvazekos.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078920b01db3---mamowovelopep.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/39746934272.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3e37c769---76403482772.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d76dd98e---pesizaxefe.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608098d079ecd---18076200330.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/povodotujixisapizada.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d6994c0---nodifojowaronanebesuv.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2dd4ff1e2610d36e1d4915ab7d6b9c78/54055515567.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/81f6d370ea37daf1e096e7b0d64e0af7/bokowifixerugikasojafa.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/38606323071.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0348cc0e79fff2673a82fb4d86e50bef/75782250187.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/zububusej.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ded91f1fb101edd9c7409b3de2840d46/62452513582.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/49057945256.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/jerulefote.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/28603655678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=age+of+empires+3+definitive+edition+achievements+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000184dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184DD 16208 bytes
SHA-256: 4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5
font_02_sfnt_off00019aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA3 11340 bytes
SHA-256: 705289b8f22f903be4328551c53d8de0f308d52403141eb9eb2585c0c4a8963c
font_03_sfnt_off0001b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B503 18056 bytes
SHA-256: 464ebf142574b92177c292f54e5f39e12d39e9d1a710c5b832837382d7152537

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