Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6847065f6734bef…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 17:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27a4961e5617d0e5b3e71f1be9d9eb63 SHA-1: db3e0ae8ce9e9f7f9d6b20ad5f165b6c531790f2 SHA-256: a6847065f6734beff70ca108f9930f89e6412bd24d797e6f5144e74c354c579f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=which+table+represents+a+linear+relationship PDF link annotation
    • http://rheumatology.institute/upload/content/file/22554004450.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65edb1de932a3c3d9b31aac0d92d31f7/sufofaxevuweze.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee29a7606---12722379248.pdfIn PDF document text
    • https://anfauglir.com/images/file/fufivimaw.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5cf4e298f---55587439445.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/57140039860.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/safibote.pdfIn PDF document text
    • http://sakem.org/userfiles/files/8344384952.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3ac3ab34dd8c5a8b21bde37073adbd22/pepovezu.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/ligajunufakusakafivok.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a10d50c8f---xalud.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tapewezegafajagozoj.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d02e7fc7c3c69266630816e7729fb365/40441976947.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///kufudidawetagodolutub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61b356bf2---29614222087.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/11281308783.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/nuxoloralilaruvuguf.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/segeloji.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sioqkpjccj2fus8k6msm707vv9/denakiwebuvarav.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/melovakubexidukorugimisan.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/6684433964.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/lepuvekusuferigojolamiz.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/titotebodedusapunoxanuzop.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81E 15272 bytes
SHA-256: eb1a0ffcc606133219784f7a8d0aa38a94ea5f37a4eac6fc709dba8f174c8ad1
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10604 bytes
SHA-256: 819b5bd29c8418481b6c959fc9a870047fc03b17f5404d9d65ddc1ae0606049f
font_02_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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