Malicious PDF — malware analysis report

Static analysis result for SHA-256 734afd3c08130776…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 08:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5317d2640fdcf615278494cfbeb5f149 SHA-1: 3062d22ab154723b6d9f31528bf70879ceb1e065 SHA-256: 734afd3c0813077661a6370246a1db06afc249b9417dab3c93cb21d15d40101b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be to host or redirect to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=grammatical+functions+pdf PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248de05f1b---xukexokawilenib.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/79651511724.pdfIn PDF document text
    • https://solturism.ro/images/file/movepatinafimajebevojil.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f5a5e68f6eb7cc1de429ca2f33eda686/kifagovafig.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/monoxupototovesosorir.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c633142c1c77978f5dae6791941b04b0/88116338362.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/jamaxofobesen.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160702509e739f---vutenader.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/26587986673.pdfIn PDF document text
    • https://digireg.si/upload/lekizukofeluvemezisa.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mewurosumat.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d54b31a53---jegibaxifo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/mewafu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7c5ad3e46---39350877542.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b68c556dc---lumapawebeka.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jasek.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/40d0d2434fe5a5c69efa8d69dadf2d75/wuloja.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/59267692085.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cp7f0aub4k6f7a0pds05e743g0/3902999429.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/nekavelaboraposido.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/kisavidulon.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae6dea847e---72405695005.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/10666316996.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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 10788 bytes
SHA-256: cef2c55df72141c8f51539e37fc330a12b351a5aa38346c3a8a493a69cf3bb3a
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 18764 bytes
SHA-256: 1429882c68e6ced73c0324231f6a6b6e543ace607eee1770cff6494801e0b3d8
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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