Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c69cb83382a996…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 14:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352b0f21d0bb41b655b9004210e29e66 SHA-1: aae94f94914eeda5810837195e0426c7a7c956b4 SHA-256: 34c69cb83382a99678227905ce99b22ae5754b4b36a121889e5b6e1efe546f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'uploads/php/files' directory, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3d6135152d4f853aa8265acd9adb30d/lobovuwawiwuj.pdf In PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6dip2g22g5l15b978piq17l6t1/26702766678.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1fbfb69815b14362c292d58c6a09e830/vepanusagakanigej.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4c50f0ab---93141925145.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dccea519eb552c38bafb3b04f0adda5d/fokawikejo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/resinize.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jebekolo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083509c3390b---79343024060.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f848eccb---21275817486.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bjmsok7j0hmespp2lbqcld7ctb/jejewedewofe.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716ea4f13a0---91417815907.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/39599402396.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e3c10a35---4096635649.pdfIn PDF document text
    • https://afayl.com/userfiles/file/28755043701.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/54561049685.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d387c1a789---65862558606.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab9e5ef75---55306898762.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b47ff4239b1acfd486453e1fb84cacef/lonebosapiguzel.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/gunapul.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/51533066353.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/bopopu.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/sapegimoluvinuvozedi.pdfIn PDF document text
    • http://limoride.net/gallery/file/80551598743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=border+ppt+templates+free+downloadPDF 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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 17136 bytes
SHA-256: 9587001a9d367b27a144c02a78afb11cf0236bfe8ee8cecc99463463a6351e74
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 10708 bytes
SHA-256: 03647ffb5a1f70bfa6de078dba85f8ebd97f0697cff3dbf93a01c2a64ff91be0

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