Malicious PDF — malware analysis report

Static analysis result for SHA-256 830bb4c0446adbaa…

MALICIOUS

PDF

90.4 KB Created: 2021-07-14 08:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33f78cdbae7d5ed50f8fbdf5942af7c8 SHA-1: 428762e9a58f78ffaf4c9b5f37484f89cdc2c169 SHA-256: 830bb4c0446adbaa21f1690a8d93fcf14d1fe8068e0d2754dc1a9505a760c31c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be a link farm, likely intended to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://bumsnab.ru/uploads/files/tomiv.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d85238a9b---46317945668.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c2nkm3oa8lucmvb3v4gkn1suqj/fuvododapisolupivugetenat.pdf
    • https://smobiil.eu/userfiles/files/mugogenig.pdf
    • https://bawwabatrizq.com/userfiles/file/52772609389.pdf
    • http://abwalabamaave.com/uploads/files/xixizakumajan.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3689fded---14623243987.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/77820843716.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5ab9b9d414816e608eeda236694e4dd4/vuweladag.pdf
    • http://ohappy.org/userData/board/file/xenuvetam.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/radesanenizo.pdf
    • http://airconbank.com/upload/fckeditor/file/guzodebuzevobibiwixe.pdf
    • http://abwferrellpkwy.com/uploads/files/1844001529.pdf
    • https://guapa2.com/admin/fck/file/44973480027.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a54758a5a00---pisutob.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e700f0b3fe8---38052140165.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ed2bf23217880152258d976002330b8c/97644048525.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/843b57b00bdb1f8c2febde4791518d04/xefukidifivedupolix.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca3a727a0---jeviliwubakupem.pdf
    • https://invest.pl/userfiles/file/visifanuvumuwugaxevisi.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/16dc5f15c64bc6c2105dcc406e84256c/9184539391.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff72155d3---nozamer.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/leegogskskaha0prammp6v9ai7/xinopanukijopisezemoruvuv.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faccdd6959---lexobifaxigigewu.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e61449178ff---wadisubokejegaba.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/79841509470.pdf
    • https://blokhol.com/upload/files/81034813016.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=choices+values+and+frames+book+pdf
    • 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_off0000fe37.bin
a25401f27b8aaa193d5ab10609091ed081f35b69cc18cb6b2cb48722ed441be5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 11216 bytes
font_01_sfnt_off0001180f.bin
08f3007711eed2fae8dbb735363ab357c5768e68c51a114ebd14b9e3d4f9f468
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 17176 bytes
font_02_sfnt_off0001450f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450F 16792 bytes