Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd03e7d249da115…

MALICIOUS

PDF

100.7 KB Created: 2021-07-13 08:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9392c7b881b3cf4d7d2baa1b199af2b1 SHA-1: e224be28adc409cd6ff3d322ec6e356a6cd06451 SHA-256: ffd03e7d249da115579011345d5295812c1cffa9c1c66dbc698a3e2ae63867a3
124 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV detection further supports its malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2522

Heuristics 5

  • 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
  • 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://holzbau-napetschnig.at/desolepi.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ca6cd50b34cf47d531ab9cd61539868d/jigomewuvotu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/xizitiwuxajitagumolud.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/mirabaruzuwebodumititunik.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/57594134218.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d28ea839b---xofubiso.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e63bf0f2---kefifutigom.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b0c8c8db---megekijawiwotuzad.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/70628287453.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/71462276000.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160896959d80e2---55657906285.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d020e00651---nanurusewodonebalokig.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/89551967570.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31dcd6579---58394186807.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/sepagelamesujeveseketek.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/8024108717.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3paehb6dknat80spavqq91ivr1/duguradakosugox.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/2040197665.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/37264872484.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9d0b10ae---82662698709.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/11208744389.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12da9844f---nexonibasejowabuxe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086d94e0807b---gibivotojodovunexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=miniature+red+poodles+for+sale+near+mePDF link annotation
    • 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_off000133fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C14 10752 bytes
SHA-256: 84183310512fe51ec432b35615edfc258ea9433a68a554d64bbd7e4497a32fde
font_02_sfnt_off000164c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C6 18268 bytes
SHA-256: 80446a8a4e66c1e3a57b142d55c3af9c40d01d465ecb1b82b85728af82979f3d