Malicious PDF — malware analysis report

Static analysis result for SHA-256 413df5f0972e89c8…

MALICIOUS

PDF

105.0 KB Created: 2021-07-07 13:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1beeb000ff46d0aac431cf85b55dda76 SHA-1: 5b71f62995fa8197e5bc2ec4cb9f2d5b45adcc79 SHA-256: 413df5f0972e89c8997fac34cf1e68c21b2720685250590907c8f1997a3a5c0c
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://chcial.ru/uplcv?utm_term=mineral+oil+is+renewable+or+nonrenewable PDF link annotation
    • https://powerseas.net/userfiles/file/mulikepeloxipimenotupu.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/2778635984.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/39720456672.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/45051172442.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/77984347773.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7f236316---54732973239.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609560ebcec1e---kafumotutofeg.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6c636b95---75188003075.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0125a5b2---sonuv.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ussbjj9sjj80e3j95niba7v6j6/10407762069.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0aa97925e---42387843368.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pimudejovurizolatekow.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/patulikojiseta.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/16adfe1986732a748bbbed8b9985c117/14553132411.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kalitapimav.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ka9ur6qapatbc3oqpn8tcps60l/23659773733.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/tiniwipa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jjjisan7p2m92hm26ob99dmn96/fesiwitifenawupusuga.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/kuxagojurevata.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/95266264346.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2867660d1---filegunoz.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/37570405317.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa6050dc6---vegenipisukaz.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/fa632b13e3432b1135410afe2c52ef49/dotetuwureganir.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_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 17020 bytes
SHA-256: 7068b8a2c2ece2c5790b2f698873749929430d31a86500f89068e1a2a99a5be0
font_01_sfnt_off0001676b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676B 10220 bytes
SHA-256: 08c89a44e7f659ba6dac190b78641e0ef045a8216809e70f2c6d6d207afeb04c
font_02_sfnt_off00017e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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