Malicious PDF — malware analysis report

Static analysis result for SHA-256 255ba98bf13b2352…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 09:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 862619fdf52e83d6d165b11243b35553 SHA-1: 913f411ea16cc27572c5d2d2e05cde62dd78951e SHA-256: 255ba98bf13b23526db9e29c3fd92a9180c37f0aeca5523af925a2a8cbabfe7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ippinnudon.com/uploads/files/14917264393.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba27931cb---bekitoruxekadoxerupex.pdf
    • http://altaprecision.com/userfiles/file/92032089233.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9598e9495b073b8cab7155965725abda/nisorepigavebawenetufaxa.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d33c0d004---48825909792.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f1b258c1---kulovukabalowa.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c67609c152a---mapugemizubasibi.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b83bec37b010c9da855c3bfed6ab193/zuzuwedumafoxe.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b07c1c9869702c8ff99609f1d4c5fbc/takupezigojiduvepi.pdf
    • http://altaprecision.com/userfiles/file/resobetadaraneduxewupazo.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34deb873---jazabinubogefotibopuvo.pdf
    • http://prime-standard.com/piceditor/file/43608512017.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ho417k07drqc95mm6fmil03dvm/66173799049.pdf
    • http://toicodonlyson.com/uploads/files/vadivurufulujaja.pdf
    • https://sbsoftware.ro/admin/userfiles/file/dumekiwuxedomorakofurab.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160730dd93632c---voraseligugapukopiga.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/xewodojunagovetigofo.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1fca2a0d7dfb67eb2785c1a7275089c2/kazuziwisipofuxuzetakewow.pdf
    • http://aire-limpio.com/img/editor/file/zodebekenusasalotiwub.pdf
    • https://lapalettedesarts.fr/gestion/file/81685707186.pdf
    • http://daiichilogistics.com/uploads/news_file/manuwivaz.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/befumusuveturuzige.pdf
    • http://ddaengshop.com/ckupload/files/jadexisixiniwoletinisuzut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bible+verses+about+wasting+time
    • 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_off0000f602.bin
d08c5bde05449c8c296866937878a3c9ae8e6738b4fe25343cd075671975ae55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10896 bytes
font_01_sfnt_off00010f46.bin
2b05ade48d8b0ab9b25305150ad3e7704df4a00a8d1fd4ed11ee67b343cd3e21
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 17088 bytes
font_02_sfnt_off00013b79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes