Malicious PDF — malware analysis report

Static analysis result for SHA-256 52020fed7578fbdb…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 00:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e41fd2a617a5de8176389fbe159b6e4 SHA-1: 9cd64c64c573955b0a115d39e2f686297951f6cd SHA-256: 52020fed7578fbdb9fa9c098435ed7ecceb62a5f3e89a269633125cb528c99a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d50a6bf70---81920423736.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b280a034288---20817851463.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b6fad119---50551102536.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/49917494963.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac93f3585---tifemi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5156da859---61751665162.pdf
    • http://archissimo.eu/userfiles/files/86642138305.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/mokulawakemiwilezusaguj.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5olb6a9hc8ao0ld0nbkg47do3v/mizimotufiluz.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mad9kel6tvnudb2mbh9plh7124/finagewakimevituk.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ve85g07rlccdcrgke3s1qjovai/jemavibizimet.pdf
    • http://grandviewheightsalumni.com/clients/79364/File/zixepudoxolovaf.pdf
    • http://www.irrv.org/uploads/files/16269365210.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/fabaroxisuzikepovab.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925f4000ca2---poxek.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b833e78e6---10234293592.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9aa7f86e8322d4658d5525e8d622d662/malabivomuwexasab.pdf
    • https://audreyheselmans.com/_files/file/8884302999.pdf
    • http://fedoro.ru/upload/file/texesiduxir.pdf
    • https://go2germany.ru/files/file/rawinoto.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/955cc612722b2c7d7f1db8ce7f54aae9/63444757839.pdf
    • http://barcelonahotel.vn/UpLoadFile/file/31553164988.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/15fa064af78ab39e4ed8f5cc9e2e6ea4/nebukabeganufafixelalunet.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3aa3b109d---94413419298.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nifty+50+stocks+list+with+weightage+2019
    • 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_off0000ee5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
font_01_sfnt_off0001066c.bin
d38ca182b1202be8c3eddfa33b91b406a72a27d59f0228f5bf8e5318a50fa2e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17460 bytes
font_02_sfnt_off000133c0.bin
20da82b5b60988b881e7b837cbe247d64e8b470effd0d3ea9fd852d07a24ab6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 11276 bytes