Malicious PDF — malware analysis report

Static analysis result for SHA-256 2598b68836ee35fa…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 18:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba94265706d5559bd90a54fd576dd653 SHA-1: 692521ccf0f7555a1b564708b590987d24e6680f SHA-256: 2598b68836ee35fab3443e998c83903bf480f4611fd8c90aa6253c2a19a7d713
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 websites hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ecoolteh.eu/galeria/file/51353474609.pdf In PDF document text
    • https://travelworld.ro/userfiles/file/zolikubu.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/71847133654.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/wabunede.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b8518e0f3dc4387444eba03e5eafe12d/77380394865.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/2979292256.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/8938382657.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983f6cd67aa---78831337941.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/47760906780.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/60705679493.pdfIn PDF document text
    • http://zuche0551.com/upload/file/parojofevivewomore.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fo6pr43s9vp9ngbd9nqr4s4uv0/gozodesajudepu.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/pituxigukipavuxula.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/10709203746.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/jejisugegiganabedatikozi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf73701eb28---xikolesoxusep.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/pujagudu.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/30719516663.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/q04rj6jiuf8vvg07aou4l19cro/sivepebigusilipufena.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4bb8c306a0c1b95f869f7d15f0e75445/36342861120.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/fepemitewakizokufapisaxa.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4qe9dfnpj275avu6b2ih2743gs/kekimudezulajok.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/mubofosipemotog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=1+esdras+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2dc60d585682aa0d20dc09a7f8a19b97/25926434985.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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 17576 bytes
SHA-256: 353f37cdd5a824d0b4cab3a84ddc2c52f330731506cf08b1ff189493f9ecbad1
font_02_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 9988 bytes
SHA-256: 119d0e8d615879b46c69a5c057c900f034b6900f9ca7f497c87e18315e1900f3

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