Malicious PDF — malware analysis report

Static analysis result for SHA-256 976b87efeed054b5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 19:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 405b35d2ad5109d8b20fe19b20a94ecc SHA-1: 9b24443bc6e4e2fe76aa24440a82d0adf6105d6c SHA-256: 976b87efeed054b5d54fcc58c518f1de42883c4cc996bc2948faa9263c8eb1db
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=talmud+in+romana+pdf PDF link annotation
    • http://premium-h.info/files/files/seponagogunonaguduvaw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/s5r897simfnlj0sneqfhelntu1/poxegabosopawaweval.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pudotomalubakigirekage.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/52628118776.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/11369420760.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/15ikk2beoh3rd3po8vpo0u50f1/vakimozaxevowiwerar.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4d506bfbcf1af732843b8f4ca4fea412/fonesidexubadukonikuwo.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/sukilumolux.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/032a92d88b803895918522b3017b93dd/nimunatepafoxefetamar.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e0a6330af---mosateninepebizatud.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/10190071737.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e05b6ccaf---17311251405.pdfIn PDF document text
    • https://unosms.us/userfiles/file/72065404229.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/70241394531.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/debidujevawekisabofolo.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/36671478783.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/61740505011.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/12175987884.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fdcd5be22c5dca5240373a86016a8790/1536809694.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bbvoehujnct1gqe89lbs9glil0/jasifel.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160811151eac71---pilususib.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/wibabika.pdfIn PDF document text
    • http://pneusmarene.it/images/file/98541409552.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/29900584477.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd60b8da942---60132880455.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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 19572 bytes
SHA-256: 4b8cce381038cfb79b97a4d64e690f0709120a9406012ad6a4d33cebe9b2ac29
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 10324 bytes
SHA-256: 78e1c2c8be62417f1963e0e232af787c5de1dc60be834efe2242e70f0de8dd91
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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