Malicious PDF — malware analysis report

Static analysis result for SHA-256 006991377988f29e…

MALICIOUS

PDF

81.8 KB Created: 2021-08-22 01:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7a5478b46a245abe3f8bcb460318a5c SHA-1: 531c8f3367b80620c17bde94b686c891da802ec8 SHA-256: 006991377988f29e168944c2ffdcc4df16c48c059df139183f9633eed9033f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/546fe574510722b8692fd300860e32dc/biwopub.pdf In PDF document text
    • https://debcopharma.com/userfiles/file/3522484938.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/xusibubipunobibax.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/64b898e071be9b9172a62ddcd43cea81/21890338508.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e52b7494---54814691039.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lepumofazawokufuniresama.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/tamivifixedisam.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/fefirofane.pdfIn PDF document text
    • http://metallpress.info/files/36387481567.pdfIn PDF document text
    • http://planbmedia.hu/files/45942214707.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e914a44ac01---74976454639.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/59833855162.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e88599897---53786140131.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072598c7f737---66291575849.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/140906574880.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/7105935166.pdfIn PDF document text
    • http://rentaruedas.com/files/others/zarixokojegubisulitov.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d468edebd02---5828285123.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/selaxelulivolopakaj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2919749194---depezuwomo.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/10044407337.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/55008679130.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/23276498486.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/nobejufid.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/93827518411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=child+development+laura+berk+9th+edition+pdf+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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 11280 bytes
SHA-256: 5d0943202218b545ac12fe68785cd62b92263ee4fa0866be2dab784e4e38cc55
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 17056 bytes
SHA-256: 623953be786431f9eba47a405c3ed85cd954327fed593073569b640f1423457c