Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b5294bc52527b4…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 09:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9d33bcebdc5e9a3dd852d437fd3c911 SHA-1: 98b5b7f17547b83a6db0899a93a1b95198e2a703 SHA-256: f0b5294bc52527b4839034c1b28983d7f4892eb1eb3ff80d0d713b9b2395743d
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tuderprogettazione.it/userfiles/files/guvogeba.pdf In PDF document text
    • http://mishor-uvk.com/uploads/files/zuvidupujadikugagotiveji.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ikn292kovl4m1pid4r2ot7fj65/mamix.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/6735384475.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539d7631ba3---32165463991.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/38474847781.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/38703176440.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b1f01e7b---30330073735.pdfIn PDF document text
    • http://stroi-sistema.ru/img/22136871403.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/82267539369.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/xegob.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/waxudojobiwuxo.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/muzazamirodememev.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/31298947313.pdfIn PDF document text
    • http://silver1979.com/upload/file/37769426539.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/xolebebodaf.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/53k9k1v5973mmt89rulfatdim2/duwusulovifodapilofene.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/vomozonuwunibef.pdfIn PDF document text
    • https://filmari-arad.ro/files/file/17642208597.pdfIn PDF document text
    • http://cl-pub.com/files/files/78311128492.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/75251168797.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/jabowejupegafakumixu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/guxomozajavewomotitesete.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/wudivakigutemizoxetuba.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/82480310641.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/kefezavusuwanadi.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/10513531427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=crush+them+all+gamePDF 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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 14916 bytes
SHA-256: 02d73734b68f0c173b97fac310c825897722021afe7e98d45ba8826e7de3596d
font_01_sfnt_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 10368 bytes
SHA-256: be7112d86f52c03179b078bdef0db7af73fb7a80ed7f76b228637dba24f516c4