Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a7bf9d5a375ec9…

MALICIOUS

PDF

84.4 KB Created: 2021-07-04 22:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 954f68c90e57fb91a684e8fb6cfe60f0 SHA-1: 4f6e844a712a149eb6a26ee91bfbf39fdf9a5c2c SHA-256: c0a7bf9d5a375ec93a4115281589dc5e2ae2ac8453e0d728abd51048ab66ceb9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. This suggests the PDF is designed to lure users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ace6dd081---88406352392.pdf
    • http://dmhu.eu/uploads/uplib/file/fuzumokifazozukimuvudet.pdf
    • https://andana.us/files/files/9754578566.pdf
    • http://abwferrellpkwy.com/uploads/files/49914257074.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/99ce590bbeb47c74f772a3a649d2ce04/gogugi.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/53421724646.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/71ec50ad21fca9405c0b5083b50f7fde/66490783262.pdf
    • http://hud101.vn/webroot/img/posts/files/vanixajabovodix.pdf
    • http://alpha-cp.com/userfiles/file/65493177959.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/18fe5d79f07d2cff9e7cff3c9853121a/funelezofuzuwovolikenim.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b98d502---kelakijamunezepelemug.pdf
    • https://fotoprint.lv/downloads/file/44123333590.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d45730cd5---81600478288.pdf
    • http://sadiqandsons.com/userfiles/files/nesosig.pdf
    • https://a2designbg.com/userfiles/file/pijamegenigelukudojojef.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b69c4d13afb---detolexu.pdf
    • https://alshamiltrading.com/alshamilfiles/file/zalipaviliwatugiwen.pdf
    • http://airconbank.com/upload/fckeditor/file/22482044335.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f56f0ed606d91b7ea9de6b36da89af26/3714004916.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07673665f---sesataxajovigebetak.pdf
    • https://albawadiroad.com/userfiles/files/kofokinisunuviw.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/togusevisedigulisa.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160957d509951b---48325064415.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/76fbb28a2df400958c5524b7a31b4279/wowamudojex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+to+image+converter+online+high+quality
    • 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_off0000e6fa.bin
c7b38723e20e4c3d6e18d7a1c3dda54b9a8d12b4b7269481fc007c59f25b4a47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 11180 bytes
font_01_sfnt_off00010072.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
font_02_sfnt_off00011884.bin
27cdffceab8f067a2bcf702197f086669bbd0817ef9a40cceaf98c58158e1267
pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16768 bytes