Malicious PDF — malware analysis report

Static analysis result for SHA-256 249311f283f3963c…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 23:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3167b607a7afeb652bb1e0d2df321ccc SHA-1: 6772fe9e22244949118161acf0bfe8ca35f90ca3 SHA-256: 249311f283f3963c020ea36271f7857b07c062d747b319efdaa0b24c9509ccf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://applecentervn.com/uploads/image/files/gigowi.pdf
    • http://adamlegal.com/userfiles/file/zuzopol.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2edc320fe4b9344f4704afa65e496e89/sajabanumezez.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/scd3nt1um101b8grl4b5ntr6g5/xusibusik.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2honkc93uaqfe6tp4pdctavr4h/sirodesokunemal.pdf
    • https://coonvalleycc.com/userfiles/file/raguturodobexapim.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/7297f2c8595176067406691543183dc3/26796053977.pdf
    • http://augustaelectricalwork.com/editorData/file/xemuko.pdf
    • http://upoart.com/ckfinder/userfiles/files/letaduvuterofife.pdf
    • http://twothirdsmajority.us/clients/38522/File/tuniwarudu.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/f2d5ppo7ci5man5959f04fkc93/vedifenalakuvatebarofed.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eeb8869d---44024543858.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d1e7b38bbc7c6ff2d0ea89d0dc0da93f/78163888730.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dc910470---felojiposos.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ce9dc157---sewanoluxuza.pdf
    • https://tonitomov.com/picture/file/sukigiwopafot.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24487ce8cd---rubebosapagexobiliko.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/75852174104.pdf
    • http://asesorgubernamental.com/images/file/62869937719.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abae26444d4---26062549309.pdf
    • http://schodylux.pl/userfiles/file/kidamakevuxepureduvi.pdf
    • https://matfplayer.com/calisma2/files/uploads/muxararaj.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/fbf6c89e49ada9643eedc8fc93da4c70/tobapope.pdf
    • http://wanyuantemple.tw/userfiles/file/12895321034.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+ming+dynasty
    • 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_off00011325.bin
8bb4925aa7286008e954e30d2d4ed45cc90f4f9912ec4e914b9ccd83cfd4a29a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10508 bytes
font_01_sfnt_off00012aa8.bin
3aa619b400886e6c0c48983f6afaa9a8aa9a9a5a3728400d789f864e40d2a725
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 16744 bytes
font_02_sfnt_off000155d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155D2 16792 bytes