Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a96b8c3a4ac0538…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 23:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 8904ffee065167e905e5419df793b0cc SHA-1: 0b00f8ddb74d9ed8f40d8f43527c1429c4e9c956 SHA-256: 3a96b8c3a4ac053883011b36d67342060e45211ccba46a2c185afe36a4aa0a56
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards a spearphishing attachment vector, with the ultimate goal of exploiting the client.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c96bb8aa6---91342028275.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd776838---xagofa.pdfIn PDF document text
    • https://datajournonepal.org/files/22836841375.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/73110187660.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcd475621---koraxozij.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/tazatonik.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3a6afa07---jupujodirowesalitefir.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vigifanow.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8db1c4d2f352e3460a2894ff74a76abb/56293248427.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/tanolezekuwetudukezut.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/48024258064.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/80472933727.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sebamopedono.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071c97d5893e---92837162482.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f46dbe3e471056fb170d267c54373838/vanejepa.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/mefupitu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/6cb928f9a61afeae91e1b3624dc88b33/96368663319.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/lorosimefilekur.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/ribetovik.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16280250441247212290.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210803121800143.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/57486989630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manual+seat+arona+fr+2019PDF 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

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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 19136 bytes
SHA-256: ba7cdeb6059756331c70ad8561297a3f895e5dba8e9ef1917d1371ea55afc2da
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10668 bytes
SHA-256: f678e32cb17181b02f892de8ac32fce6793ec3abab493ca5b724794a413e2d56
font_02_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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