Malicious PDF — malware analysis report

Static analysis result for SHA-256 649b9f43a49d8e00…

MALICIOUS

PDF

139.2 KB Created: 2021-06-28 04:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7034fa0ca509756e4df3f4c08ac8a901 SHA-1: eb30d3755c4ed8a8ba6a776b164f3b751faeaba3 SHA-256: 649b9f43a49d8e0037564bcd29c5b7ed11197b2552314c3e8d07dc043e8afcd1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d908636c96b---dalegorinazikojewasot.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828e41a1e5---robavexofos.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608969d4a3ee4---38433087004.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/18208540897.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210628043006.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e10869e38---fapilirudutujovagurutiwow.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/7036130902.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b6e8ef25---83558875706.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2db998467---wozibodefigaletojux.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfddefeb432---172739067.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/60e8ed5971cf5dda385b2da5e5657e98/75800244542.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4263e3f1---fexidudejuvuwopefi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtkj7m0ive0eoblvjrp9rhqk3p/baweko.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b00763c0c9fcc93bef97148bcd88c91c/makib.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8386c1588897a4b84d4f3b53264e682b/lujuxegojex.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7ed3deva3rjutjn4kbf5t88so7/50208602819.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea1e9e75a---gabazelotu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9a72f8464e19f7faccffe49d276909f4/kekepelodugimare.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5322fa73---56972323269.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/22f736e4dbb6730cc30eab6fff83a9a1/1141836008.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/47081656605.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sukikokupef.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c384d3bcc21---12741514767.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ovegbom3julug4a1k2745dgi4r/nubevodulun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+scan+several+pages+into+one+documentPDF 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_off0001af1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF1F 11100 bytes
SHA-256: 784a733f9741e65f5a76f5cd97fbf60f9bfc19d99a5eb986f4d7b64ddfbcec0f
font_01_sfnt_off0001c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0DF 19320 bytes
SHA-256: 769750476c037bb073dc13e97088f1d15fd864a78387f1572f2bc4804b947f4e
font_03_sfnt_off0002145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2145D 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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