Malicious PDF — malware analysis report

Static analysis result for SHA-256 947f56dc438b4168…

MALICIOUS

PDF

100.3 KB Created: 2021-06-23 04:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d69756344220c2b66ec77657135ed173 SHA-1: 057fccadca220cfe01c0af71678127a436ea4cfa SHA-256: 947f56dc438b4168c296c94653ab533f2afaab199a6b45fdc852e1c4db3356a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests it is designed to exploit vulnerabilities or deliver further malicious payloads. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://inwebjor.ru/uplcv?utm_term=answers+of+science+questions PDF link annotation
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/17226564810.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/labiza.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d3c0251be089e592cd69d218283f4e91/57009197005.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/lumej.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/vimakajedofobetinumifa.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/texumojigajagigu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/9392389923.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/61918858537.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/17321018606.pdfIn PDF document text
    • http://allycatering.com/userfiles/93920994770.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab6a39bfb---niwegazubenuk.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/667731e8dd49e8aad5922d34d192464d/jepigunafiwikofatuzemat.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507052112851675.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab750694259---xexivexorozulisi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/wetivulasodedu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d9hps08213dfh9bph953l707o3/tuxotujetasulozanususepub.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/pezekizidusev.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/17734411795.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd083bf4a---jurepusuvoxesilojuworus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E37 3300 bytes
SHA-256: ff2a55a99075b5941c3799af3c26505ab2b7c1089b078a0d80e033727057025f
font_01_sfnt_off000149de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DE 4840 bytes
SHA-256: 7839744b9a334547220eee77fc5928f48c17eb685bde3b7dcc9af0bf65cc9ebe
font_02_sfnt_off00015a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A80 11668 bytes
SHA-256: 41b919f21a2997ebe8855a0ab657928f0b545dee6716350c5b8634e910f42db0

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