Malicious PDF — malware analysis report

Static analysis result for SHA-256 9508c850b17d991f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 15:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 953db9d56e022c216f5039ad0050d5f8 SHA-1: c3c82f647942c91a58ca50ddc975c1a98b8ab06e SHA-256: 9508c850b17d991ff7b72501830699aed357d37d195c273380a8d13ba9a4ec22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads, designed to trick users into downloading files. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085f35e92091---xutemokoreze.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5bcbc990db069f9e5cf25b948a14026c/jotusosozasedut.pdf
    • http://envisystem.com/upload/userfile/files/wekakob.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/numadirukovesewib.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c039de55e0acd16ca1b2f27c721fd5bb/97877083441.pdf
    • http://interel-rus.ru/test/sites/default/files/file/nuribofukuxulivuvogaxep.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oguberhhu12h61e1h5i0uh7e8v/wupikabobodevabow.pdf
    • http://beerskiboot.com/img/upload/file/8012507443.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7e008e72---pirinumibodurelabofiraxu.pdf
    • http://drairtools.com/ckfinder/userfiles/files/wuwexi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16496827---ruvigemufuz.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/21ce9f174973641174acec21169e6dfa/43992023455.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd3579ef8---70098990951.pdf
    • https://jambukuning.com/contents//files/rizorav.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79321f375---kefotakejuzimamuzuxen.pdf
    • https://nepalimodelagency.com/userfiles/file/92687413142.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83862581cb---didigudilugameruw.pdf
    • http://belgium-ex.com/images/blog//file/medowizutisudor.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/j9ptr5lkiuf3rr6mud2o94h55r/desovobamejalafapezi.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/eabb7003e62a00dbf8abc5fa6d0d7a2a/79627055541.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eb6c271a8ce5af16b7f764fcc12b3f1d/wizis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=smart+switch+apk+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin
27e08b01a79c0d515aac852d7a93355adaea22de107590c707add3240f4eb980
pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 17260 bytes
font_01_sfnt_off000114d2.bin
2e998c9ea7359aef09a2eff70412b7f49442f0daf3504cce94490ccd460fc71b
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 11140 bytes
font_02_sfnt_off00012eac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 16792 bytes