Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca88ddf2debb9da…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 01:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d78f05c6480b347fd26c9ae3686148e SHA-1: 6cfd3fe2ad11fbd8f45c0a6e57e95be9dc75fa09 SHA-256: dca88ddf2debb9da03676818f523f369731b191882e46b06bd433ea75dbbe0b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites utilizing common CMS vulnerabilities (e.g., formcraft, super-forms plugins) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f3l3lv0kecls7m2o5jj2hmsrtf/24152987012.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d8ae0768636244392e82e26d6d04f555/59816041165.pdf
    • https://dermatologie-francophone.com/userfiles/file/kebelor.pdf
    • https://magatek.com/documents/file/6013902441.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/74f1e8577aa015ae6306b784efe95c38/dilubevijuxolevuru.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff79f3a556---jojumorawiwuvinu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad408749198---lejepasobitelijimomi.pdf
    • https://grupahatak.pl/admin/_fck_files/file/97040892418.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccb3680d0---kaxawimibekaxoji.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0kio75nbmb7u47jp6a0rj1vgk5/51715755661.pdf
    • https://asthasupermarket.com/userfiles/file/tisojedebas.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d635014d1a---23823001076.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873dbad2131---33596051489.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3edd79a53c---2661095947.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/mibewe.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d54f25b05---32505229.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/662944a0c3c972f4874a794d102e569a/wikove.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e174549c814a2b99bf48fab8ffb2a3d1/tutumesej.pdf
    • http://hoanggiaphatland.com/uploads/image/files/63892963256.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3b6d4894b42739e976bae56b1e3d05c5/96630598247.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6034df361---38135355766.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071493875c34---bulefebabazudu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+a+substitute+for+red+wine+vinegar
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3d671d0e---renamojubibemabiw.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_off0000fa0e.bin
e320791d49afb82ec929304f5f7a19945950efabc183f1c57f95bf1ee4cc49c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 10972 bytes
font_01_sfnt_off00011358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 16792 bytes
font_02_sfnt_off00012b6a.bin
30f41107aabff17be658725c7d606ff207867d0bf018fb6b504fbc91a86a65ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 17700 bytes

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