Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09b2cad8e6142a6…

MALICIOUS

PDF

99.2 KB Created: 2021-08-09 14:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f53dc8b15fcb40895c315fb63e628e05 SHA-1: b8f5ed9d9d01e124a2d112db3b14c3c9c4ef80d0 SHA-256: c09b2cad8e6142a6f5612298ed27be8b13191c52db9225dddab986acdd936de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=pert+test+study+guide+2020+pdf PDF link annotation
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/edclgpjcg4o6kgagg6utnefkse/36792765668.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bm5p5dhslqlfclvuat6iaudka/sawemutofamun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086376ae2eda---gakedotuwade.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814c23329d---86160996006.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/rumuniliruwunatefu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bovenajebenufuzadaxuzi.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/77411300063.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/2551943751.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/naxukubarejixuwiravelega.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/16612032972.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/668491dca26e31c4b2de58164b72b96e/20376962653.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/31009692728.pdfIn PDF document text
    • http://rc-modeller.se/images/file///dagusesafasefo.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/37186c02e643c31e758a0e4c19a3744e/77938798372.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/rajanufaxamatixigaxixasa.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/89763472681.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/99dc0cb4cdc1a174bf18f0006897fcb0/nixover.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdde7a326---24443808979.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/175480c2b380cf029c151869923b0918/2911853930.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ff9098746---lopijizel.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098883c2f6ad---86680625947.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3070d4aaf3---34740227054.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/lutadekumezomadoxutanado.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb1377b9b---22286324955.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0148681663---wubisapebit.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/84820732890.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_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 17496 bytes
SHA-256: 1a86ad6515e578790d8140668b25684daf61d5799052bdc41deb8f6f3d42bec7
font_01_sfnt_off00014c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4A 10700 bytes
SHA-256: 9a9763b805c4042fb19d96e5520272d37d8d428039ee115efde2a408832ec0e3
font_02_sfnt_off000164e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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