Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef825354507e703…

MALICIOUS

PDF

89.0 KB Created: 2021-07-20 01:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6d95bd8c851f7135fbf542830d3103e SHA-1: 8aca86abc53bf6b5c04d74f0222fbf16f0bc748d SHA-256: 3ef825354507e703ebdc14766addc1d54a156c5c27855bfd849fabf558a9228a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://cochleartudaskozpont.hu/files/vixawasubinusowodegep.pdf In PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d746c023---xujejizofutetawivusite.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/diwoponat.pdfIn PDF document text
    • http://robbes.nl/media/files/madunokifa.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/vedotideb.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f304fcf73a---99751640632.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8c09ad26---20747456803.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vptcs0cepkbs2t0anvfs8mshsi/mulusuvodexogiku.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/9607815115.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7907abb59eb477e3e145e9f78f19827f/digumuwetab.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5a8a1948---xovudu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/21615445793.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd33ad3026---raliditifekoputepojuboxim.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210719112449888767261.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/genijirefubu.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/0d68637e95f10552cb85c8ed8f65afa1/remopuzaxejaxesukufuvenik.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/10777654255.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f2e8487725cfcef498286d3017ea39a1/wezivosilalo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/66cdb7ea9afbd6665e43e412a26592ad/78408685156.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c1d1785e36042cc16dca5b283ecfa090/zoxegezuloxeravatesa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14746e697---85682677034.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ac48908b6---29316160535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=causes+of+whooping+cough+in+babiesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 10872 bytes
SHA-256: 632341b7184524691de40b265724febd0a40c960c4e9a2684e6581651f941a06
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16584 bytes
SHA-256: 78b2a305d34f46410d39a325f61d7118cf6cbf79b9a56d061781101acf54e80c
font_02_sfnt_off00013d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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