Malicious PDF — malware analysis report

Static analysis result for SHA-256 f126986a4b89be6e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ab0b2dae0c4ad553245fc6c08d9754d SHA-1: d32ebb1a7d7a8dcbf08922bc2855c6c96bf86243 SHA-256: f126986a4b89be6e4fed39517c45b63857e68760d49bef837a41bfb99a027a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://isabellepieman.com/userfiles/file/gatoziwageja.pdf In PDF document text
    • https://newline-eg.com/userfiles/file/fuvoriragamafalafapuwaje.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/sutebudujisigifam.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2953a7f677023e496ff9f56ce1812757/nefol.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/68839571892.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/7670098055.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/16525442992.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/21733139500.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/46083258742.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d702114d850---palixumunitam.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/luzutewasena.pdfIn PDF document text
    • https://svltv.in/userfiles/files/80787348637.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210820190424.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1404d4a4ba---tofafugulekonerupopilo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5f1b42232be78083dece17fc91d7e1d0/rovexedirofozolubunotuwa.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rlm0lfrm5phe63e5c34539rna4/68504765480.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210630_125058.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c719370d---93003948237.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/92bbeec969b54260f374da7a3a59aba3/20777667059.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/15576754888.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d9ba921c90528fa8f44171b0f194b9b0/3588082105.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4dk21bkccqufbop659i3q4rpd4/57001392713.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608adab04bad6---jarutivave.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/ferewuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=de+morgan%27s+law+examples+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_off0000b950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 15932 bytes
SHA-256: 69437ac855ae88d1061f5de6427a67c4db2744dd7f7e616ab0f046a85211127b
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 10876 bytes
SHA-256: db308867c52b86aa2a1f3603739c7d1f1af84e06d37c7b0808f39faabcb74c21
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1