Malicious PDF — malware analysis report

Static analysis result for SHA-256 5585e68cc6b899ce…

MALICIOUS

PDF

82.7 KB Created: 2021-07-14 05:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb2e89ed7d56ae6e838ceffde238afbc SHA-1: a274cca5467ac2eb42295ef4bcc92e7289ecd94d SHA-256: 5585e68cc6b899ce283868260ce593d87594441e3982bef5ee5fa2e445846c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the malicious redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hotelbellevuepalermo.com/userfiles/files/98107986360.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/86260151125.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebbb8c911---jofejidezimirezof.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f1455d001351d6b19b7427499f6f4fd4/89007085550.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/rubobuzarefixa.pdfIn PDF document text
    • http://atomleasing.ru/media/File/vejaxoxugiwobe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/94065618462.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pusefuzelirudutinugemi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8c1454d8---21365005572.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/dulox.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a00935db8d8---33162188953.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/94eabd827feae09cb842ff3172d28722/17799691445.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/nozifozobaxajese.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1e545940---nisivivi.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/zifas.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f8a796de2bde9615180bdce820a0d2cc/97056713466.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/78700949183.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gig429ldjoagcapsbgd5m1ris7/ripasosabili.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3bf816288d68ede01da4f14c6cc92f68/fonunesidemunuxudus.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/xiwapilaxodawawiputebural.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/828ce34c553a0422bd9b867cc95b8ed2/kumizur.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160768b5cc840c---53054988995.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/niwirejarutefilo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/81e82441980744d3eede80ef1c8f3f4f/26582039692.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c45d61f66---37063726255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+does+correlation+coefficient+showPDF 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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 17128 bytes
SHA-256: 4ad59f28404057f80cfe758dd0738d6a1149d9fc06dbfad4a9eeab355d898867
font_01_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 10652 bytes
SHA-256: 074f47fa0791644813350686bc3a4720b9872aa804085252e4c8e5c8078bc178
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1