Malicious PDF — malware analysis report

Static analysis result for SHA-256 584827a3e50d44ad…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 09:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 151f32c64d7a5e8846e8ca72b450a592 SHA-1: f33c05844f60c9c5864159416d595b35f27537e0 SHA-256: 584827a3e50d44ad688b840b0bd7dd1fd1c42276b8c42a0dd52ddd5afd20b336
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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=sight+reading+exercises+pdf PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ccd9c060---66874645707.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/254788f52d89a401d1547d0424a4d094/43509731122.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/pesaze.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0af159f23---kodakuxadoboviwol.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/46610323730.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1b96a55c---girukesepujov.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1629932600271.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/93029137418.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3688819ea---14489974502.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jimitupikuvipomorupevipu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pinefovajirelevujotejixus.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sbb81vt4epaq3adskuarav2moa/sozerenilidu.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/bazan.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d2c9bef9---516814283.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-30/images/files/jujepijabiwediwefo.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/luvivo.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/50729237619.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/8971441368.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e089526a4d2cdd63d4e0c7184b055960/271544531.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/suvivowuvuwuraveg.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/88461834487.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/musosijonedipapowevenaw.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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 10908 bytes
SHA-256: fc8be5bf4024a58bfb8148b7f3f93ad4d847635705193b35510a2f1a2d325d47
font_02_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 16384 bytes
SHA-256: a269fad2072dd25861e78ce24e762c1ddce458b1279f6e390fa2808ddb87b19b

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