Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7d5bad34359a11…

MALICIOUS

PDF

82.7 KB Created: 2021-07-16 23:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dcd740d8aa867452c87a7fd6ab62c354 SHA-1: 9e9d93904fe116b7252fce29a9131984bcc20e18 SHA-256: 2b7d5bad34359a11b19f709c56e495cb3f4e8a07790e888238739163f35b6e91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://apexhealthnutrition.com/newerac2c/userfiles/file/67003684349.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/52aleorvj6td0mmarpa1606243/93423990923.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/44891527851.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2e4831103---xemumizek.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/nexuxowudikikow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c669fb94544---bogezerewo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kozasakijakuredopokasowu.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/21822596167.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f8571545---rebitiri.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/49940544254.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/nanugalozejegur.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/femavexamozita.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/natugerujulomimixozifon.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5c9a7a6f---90042744603.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/70135099528.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/78451924632.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/80881459677.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zavifagepujifosi.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/65511180748.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/lowojedet.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/93231744004.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9105531f---33247203984.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f503b129559fdc72e638e213cd1fad/luzimuzunekubagutuzozaxu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717e527058---76977680276.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/tofugemirilolekalado.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0da8db746---zuxitegisafota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+plant+spruce+trees+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 17124 bytes
SHA-256: c114a718333f6a4d474d7a309b8c5c23332d0b367ca61fe76d231b4eea210433
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 10820 bytes
SHA-256: e32fea0d1688fe146452e442335164ab77f51aec886cecaa6dda5b700d5c273b
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1