Malicious PDF — malware analysis report

Static analysis result for SHA-256 b718222e5db72acc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4edffceb93d367289273d849cf4bf066 SHA-1: 7dddaaa1f82990303d9bac7ea5e56f925d0e18ff SHA-256: b718222e5db72acc105c1df7f2ac3baeba2c46f05f37826e18ea9a9c990d3ca4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, 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 distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://langfordfinancialservices.com/userfiles/files/17612426637.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7ea8cfc1e3dc5edb6800849686ff05c3/72938579913.pdf
    • http://terezmisszio.eu/files/file/11035838031.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/texufezada.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c7a05446---pesor.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0737e9ba56---rajegafenukes.pdf
    • http://ilyxrace.com/userfiles/files/pajiniwozakuperage.pdf
    • http://nousgarage.com/userfiles/file/leruzemaronizuloravumep.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a31d0d743049074ac827ade09b3c6b5/filozelukate.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/57577fa0a64c4e6c51a993310e7bede7/zokipinapu.pdf
    • http://wksx.top/images/userfiles/file/boxovutu.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/roper.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nimelatigu.pdf
    • https://hoongnau.com/upload/files/99434145310.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/xaxuvezilulafibetesiz.pdf
    • https://investir-petroleo.pt/ckfinder/userfiles/files/2942256400.pdf
    • https://lawina-radom.pl/files/file/78504163608.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/pawawegeloxikejod.pdf
    • https://limpiezasinasel.com/userfiles/files/50883866507.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f86d19b9---20918599802.pdf
    • http://generale-bureautique.fr/gdb/files/file/tomupunizufalarisar.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tibos9minvhn17fif4a55avg9s/pazomapuruluj.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee5280d558---rivilasopinelinu.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/61592991292.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/15807441625.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dharmendra+mp3+song+a+to+z
    • 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_off0000c291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC291 16792 bytes
font_01_sfnt_off0000daa3.bin
4af5f3ee4a2f6b080ec010ee4174c2ba09f9095ff99e6d11a22de76f23c975fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16060 bytes
font_02_sfnt_off00010454.bin
fcb1e0bead67117c9a591ccc3993a2d74c8021adeccd88cbc6d2b2b5b08f83a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10932 bytes