Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a029a2d02efed7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 15:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cbebf4575310401ee2a74257c021b83 SHA-1: 9308a08f85d8b579eb3c8e9c9fac891669040dbd SHA-256: 84a029a2d02efed77ab6766c0ea0d51a5f3acc34c1e30a8d559e73a4430c8d91
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161358f503acbe---xodosekupekawugapefa.pdf In PDF document text
    • https://chung-pei.com/userfiles/file/zozimukanubebebaromege.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fasasew.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/pajokoparijujivugemuz.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/83289669731.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/823d644099b6afdd164be74a2a4235fd/mopawokisebamij.pdfIn PDF document text
    • http://evola.it/userfiles/files/muxotosulagozezuwape.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wiwesopozoguma.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/49904680225.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/10049380438.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/50001012612.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/fasagavebawokamiropexewu.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/44023647454.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/31669591285.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/44207783000.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d785e8855---zetonepofazijizafo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067cbbf610---rogonegusima.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/59568545062.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/45805045548.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/bovezesugo.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/kuxejabikoje.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b7c8dfe4838b6899322d35592bdfb682/93239806485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cara+edit+foto+tembus+pandang+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 16772 bytes
SHA-256: a80f1796d7f24163c927d54c830e49877bb2a87ca25aace325933d1b210c78db
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 11068 bytes
SHA-256: 3b8bb62b1c2bc961f36f6b869a87879c12654fbf38b382f76f3e50ab69fbd20d
font_03_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 17300 bytes
SHA-256: 69af1077703f2b7114cadbf000526c93dd443a0ebeba49ee7a14f4f1c1c6b936

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