Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf816aaa01f25ac0…

MALICIOUS

PDF

95.4 KB Created: 2021-08-11 14:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5def6ef5bdde8b2dc12eb933428bcef5 SHA-1: 34ef487c13487c16fb8208aea3724ba6ea87a944 SHA-256: cf816aaa01f25ac0b928d93fc6851dd38a8e3f984fefa7537b3e4a85a2ebb080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to further malicious content or downloads. No scripts were extracted, limiting the analysis of direct execution capabilities within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=libro+computacion+basica+1 PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d200aa5aaee---62415948334.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/sasofeludopujisufuredujej.pdfIn PDF document text
    • http://focostrade.com/files/20210707092037.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jesatq10vs1jcgs8gcmuvljdpr/rukezujixolorumidatus.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/19772650108.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/45099454174.pdfIn PDF document text
    • http://maihome.hu/admin1/file/16489728768.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160892930cbe0a---68228276551.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zotabubu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e6d853f1---rifowosepe.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/sudebofusupojiwadetok.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tfmjmd382gnctedn0ssarg7t5j/xuwaji.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4b501d005b2b1873dbe029b0253bbbb9/31622994742.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/38684465638.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/766eoqka1tkqn51ttfjbdpsgs5/71775992482.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/93469860123.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4720d176b---fuwinodotetawanuzomazo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/36c8d3db7ee9076bc2ef1d67f46c1d59/gogitalekox.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160781985c5df9---difamomexoru.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8dfe9305---ruduvajifejazexobik.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/76830496632.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/33435981226.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 10608 bytes
SHA-256: 20e689c6b2c062ec894dac81199f7067f6c43c0e155dabbb08787688fa507e25
font_01_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 17780 bytes
SHA-256: 34b898f79d9967251efee9df4f5e7ce961d8a2436a74864906454e84f8197f74
font_02_sfnt_off0001566d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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