Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7df422cfd09f49…

MALICIOUS

PDF

78.0 KB Created: 2021-07-25 21:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4dbb3f4fd1036cc8aa530118ee9c8d0 SHA-1: 974bd3d4f0ee012f632d9e8b2a4cd591a61ffd2c SHA-256: 4b7df422cfd09f49898eee1831ce6ea0b7066a7d6426501ca3a9fae6d68b71fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://babywagen24.de/userfiles/file/xuzajata.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f93fd30bfc2---rodujatutopojit.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/lebuwafarosozamibid.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/da68s0ghuttccnrc5o2t4dgb45/52929954449.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b5ab8ef0---boturidurenu.pdf
    • http://kleinschaden.expert/userfiles/file/ponawodinegegekepiselaseg.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/161e786cc8eca10c2053cdad07edbc57/wudewaziwazijidaxafuw.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd879e31f9---vivetokawoxilidi.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f887bc30---vawasuxujav.pdf
    • http://sam-global.info/files/file/nowopujejijujafirir.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160970826c8a53---69686815262.pdf
    • http://ctkupavna.ru/upload/file/wupilinepasesotikapuri.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1dffe38c0---lepizenisorug.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6b9384d291f07319e84599d729558f71/wanumuwezofibivezijajilam.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afb36ca4482---tutav.pdf
    • https://alakharia.com/public_html/userfiles/file/23614704155.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95d2b0c23---vaputurof.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160927bdade21b---zagelemar.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e376a51321e---wukodurev.pdf
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/38668389956.pdf
    • http://sklepjola.pl/userfiles/file/detinexujilapokokak.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/mupevamikovugisogititava.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+apostolic+choir+hymnal+download+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_off0000cb03.bin
bdf561104d5b1f0f0a90d4c6e2c2c0d102f5a2a1071a0ddde2f46565a5112334
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 11064 bytes
font_01_sfnt_off0000e4b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16792 bytes
font_02_sfnt_off0000fcc2.bin
ed20b64fdba2453a0ac6d6d7e976a634f89ad2e5c44c2571eb02f668131f0d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 17472 bytes