Malicious PDF — malware analysis report

Static analysis result for SHA-256 09219c9ae4e81766…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 00:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d68e2c738af867e9440431317f5dd862 SHA-1: cdba5515b6fded3ee9d42279553ed4b96a186dec SHA-256: 09219c9ae4e817666e3f973fbfb9152694916f1e2eac91479a0ef04defc5176d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://ivanda-commerce.hr/userfiles/file/xetusitixonatazir.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/dc418d1311eb4d4d3490935e4b77ef9b/sevorofebig.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c4925abb6afeece2a9652793bc2f9fc5/50696680960.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/weralonedadokafom.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/67050705871.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/pokurajuzatuxowumosukoxi.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/65685855960.pdfIn PDF document text
    • https://attack.lt/images/files/10509130367.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/gerupupigupavijabavot.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sujonoperutirunidem.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098307177ba2---xapiwesivumaxutusesutu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/tizogixokape.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xazukinix.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/87383033237.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bb032da54---jifumotamewe.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0ab11759a162cf08cdc81d5c622dae7f/48845401625.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/edf6a89392d454098eca4b859a5afafb/74037063369.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/af36395db8c781f0159679ffcac48326/wojegasubovenum.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/xegudup.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f08869df4---nowinozigogisovozes.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161189b39cd5d3---xojoxobepomedewexuxubojan.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/xagoxobafevepazukodexil.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/mawosow.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/72917564419.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/gurewuzipukinibiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+to+pdf+readablePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 10468 bytes
SHA-256: 13f9758aef9b175f52d27cd5bcad1651b91fce8a67b477a98f3ae9d88130859b
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16776 bytes
SHA-256: b84379615bea9da915f0b37bebe2c8e75a08fe9d67a67d31fb4bfca736fed225