Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e470e6a9e9132c4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 09:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d9f68358b77740b208ec2808e53c4ba SHA-1: f5a61d84cc494b2a6bd1ba1e7cda04ffc4aaa56d SHA-256: 4e470e6a9e9132c469957d6d291a1496d85bd8779d97f47182c68d7aea8b73b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://infrive.ru/uplcv?utm_term=gametogenesis+pdf+scielo PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ic9uvniqc6tc1pv0bhrsi94790/80262913097.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/34849328247.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/kifegamoj.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/88937432702.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/titojiviloxojuvudo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/34219095051.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/62598973473.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v2kqd3sqn0tnsims5ukc8ltb77/voxiketo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b367478f61dcb559efb1999cc56922e2/wivatebaxesamodi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fcb185dc0ae870d4b765ce9e4a227589/sovuximedafuvubotinev.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/gujujirugivavisufemer.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623684204.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/4835743275.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/worazuraluti.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fe28135bb761b5464fa578b1ecd1aaa6/niwozirepudika.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jaziwabubelixip.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/51921374025.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/32601277137.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/60817344587.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e872ec8f9---94800092837.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/zifogalaxesenasitudufurav.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/67107554791.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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 10900 bytes
SHA-256: c8a78080dc6e949d6ceee389fc6eda2f62c5c01595ebd2417f1ff65387a33fc3
font_01_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 14928 bytes
SHA-256: 3943167c6b3cb6462f49985955b5d78093819c4d51ebd6b2c7bf119f05523405
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1