Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88374c290222e0a…

MALICIOUS

PDF

75.8 KB Created: 2021-10-11 01:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7f4d62feac9a214cb8ea2dcf780826b SHA-1: 98cf18afefbb1cc0800e20553ada3010ded94e0a SHA-256: a88374c290222e0aedd31419dec79f124f2e1f7a37d28dbba7f2dac8c46657d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=neve+campbell+filmography PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa91f2dbdb---34992582619.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0d9fb03e5---sededusabizavupevemo.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/82981185647.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e4bd7911b4dabbb54ef93cfe7f2413ba/xadituvuwawo.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/nalinobekafajobewowekazim.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/35081114669.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/satarenuz.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/64564771744.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/2363037774.pdfIn PDF document text
    • http://seritour.com/rsm/files/pekogizexexelaz.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/84041115012.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/gojojajas.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/taxipir.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jowigenuti.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/99137149147.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9d623242378f71f8517b3fcba6c677cf/83233820004.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/wilefozojefeg.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mupalisujafexasuxumow.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/vozowawelarideredozobi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157424086c82---73153652566.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/nulerap.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/95037786002.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/13418903236.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/6371653906.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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 17848 bytes
SHA-256: b91d2262ce066e441b50619b972f3ff1e2774adadc3360edd952931d2a25daa1
font_02_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10856 bytes
SHA-256: b5a366bbd59a394a1d412d9a327d51a74f301a81eeb9edead6c35abb7ad4a8d7

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