Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7927f8014e8127…

MALICIOUS

PDF

97.4 KB Created: 2021-08-01 07:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20ccd4805502367b6aa53d4020b536e7 SHA-1: 70d1cfab5b603604c257656a66b8b8c4ec08452d SHA-256: cd7927f8014e8127f79f47dfe7d3aec461b3dee4e80f10350f7f54c3dbc8194b
156 Risk Score

Malware Insights

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

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 pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of potentially harmful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c2657df8e---92063814676.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3b58b5347---44425799605.pdf
    • http://tokyoto.pl/UserFiles/file/19124669516.pdf
    • https://cissud.com/uploads/ck_editor/files/buleledawinarini.pdf
    • https://agriturismoilcolle.org/userfiles/file/79560388947.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e299207d0c98ba7dd723c96c5120fbf5/25000736651.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9379051b---23816886483.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/47904569e919a71925cdb04474bcba6e/3251348943.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b8f5ddb0cf1e877586df15e86ced68d/vonipov.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2de0b35375d2851761c3deed71373481/99564898834.pdf
    • http://casier-a-bouteilles.fr/file/kibirux.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e9d6c250---dixaximomereguzeligewe.pdf
    • https://gachbinhduong.com/upload/file/14139386298.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b6707d378---samiweteves.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8ptrl5biscjhrhf2u31kb5pmtk/kukigedezanax.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6407845b---73262974889.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074671f6784d---9306265734.pdf
    • http://consade.com/userfiles/file/jitiropazub.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4f5914c648c60dade189a8355c4c33b4/45119952118.pdf
    • https://bfull.ru/uploads/files/palaluwumit.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/r5kvc5346mmbgdk0pccd1n4err/nijujoxumivowak.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/xuzisifixopixelanono.pdf
    • http://nuestratierrapremios.com/campannas/file/84391682972.pdf
    • http://svb-volleyball.de/userfiles/file/47976537882.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=blue+eyed+miniature+dachshund+for+sale
    • 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_off000113f8.bin
72ed5fdab0c00308118bd284fce19a880cc0880425ad1291f04e45d0db75692e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 11008 bytes
font_01_sfnt_off00012d69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 16792 bytes
font_02_sfnt_off0001457b.bin
f5144f71e13ebcaf607e062ceb2458c661b7f49f88be968c36130426063c9a70
pdf-font-stream PDF embedded font (sfnt) at offset 0x1457B 18868 bytes