Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6752eb0bbd113af…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 12:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: faedaa9badc4422c985e50fa9d61ca5c SHA-1: c894131c846b16323662c36161fa6277b130d6fe SHA-256: a6752eb0bbd113afff21f310af48e259c74d14caac7ebe8288305f3d0f99ef15
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://forma8.kz/ckfinder/userfiles/files/bonani.pdf In PDF document text
    • http://3e3i.com/UserFiles/file///wufiwifixeviba.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/25333446050.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/36209245287.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210812_025209_159.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/18735212079.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/7dd03138da4947d09b95fa7084a9aaaf/rivodakojugojanisusisidet.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/fiwafovijijedasu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79d0be5f6---nodimepixamuwusasap.pdfIn PDF document text
    • http://lg-palette.com/upload/files/jozudituwa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cdd8d194---kidekumefana.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073245f2d0ce---81088882908.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/47730807780.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d9fd306f---68750214462.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/plv4qbj1paecurmlbbls59ll02/derozeraniramafaliw.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/20977531027.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/4gm5drhbsfbgn5329rthb1j9du/sutibirubetuludutipe.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/delagejaxabewizamuwu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/af0f31d28ba61c3ad7e4e27dfa5a9a80/88632835156.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e376a3d09e---surufukibadekuduw.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/58da688fd3369451cb75443334b3e72e/68214092893.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7rbufvk1c3ve616r5tp2bun5ij/juripezadanilasaj.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/zifagogesejolaxi.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/zisadam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dictionary+of+chinese+characters+pdfPDF 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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 25308 bytes
SHA-256: 1896fcb9f4faca85ecb75e8d24d5a11f6259d50ac28600841295725ad38c7981
font_02_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 10784 bytes
SHA-256: cb462792cf315e093d4a6ecc3175b70358f5308b9f562802868d16af8b4a931e