Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf91611a8633a85…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 02:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9fc47931092762ff43042914bb29525 SHA-1: 7212dd5174c352cd8aa89d565e84a777fe4310fa SHA-256: caf91611a8633a858bd0e76dbe83a2cf92b514fd68ce060fc8c8e701f9e27fd8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=fraction+division+word+problems+6th+grade+worksheet PDF link annotation
    • http://blbr365.com/userfiles/file/1621209542.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/47066539824.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b27d0cbc---fusokinokokepin.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jularofisuki.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6f1d51654dcc4a794cb37c0f7da6c663/12956846506.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862598625ab---luragotiritirolijibibasov.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bekukudafopepos.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/g6vago8b82rh4mc73ges8gtat5/27847336523.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee8520580---temoxonaromitexaraduniwig.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/pedusazodojaviretev.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tegukuwetekotebuwix.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2eeb79679090a2ff0f9d7f4dabd57fbb/46629557713.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/67225881166.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/vuxosulasaxagivox.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393d8ef6c9---95435849104.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/20148495562.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/56880169341.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdea8c29846---fovuvudebuli.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4ec33ac7---kepugabovawapedeva.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b478ee8275e---guvozadot.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/6857922807.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/48148675990.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/50082115494.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/64198a9f38e5d7243218a2fbe0e59abf/benilinikosiwenusakuxujiz.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a461f7a9df2ba890a6643d5926bf9d04/59947350465.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/65594151993.pdfIn PDF document text
    • 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_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 19012 bytes
SHA-256: f509127d8e73c30a1b67f997ed27d1c102290538659afc6ea25ebc8c83a89a2c
font_02_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 11488 bytes
SHA-256: ead7b3da08940eba56a9ade9c3a6b53a0b93256bab30a253eeba0889341a0c93

Open this report in the interactive analyzer, or submit your own file for analysis.