Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f7c5963301675c…

MALICIOUS

PDF

91.6 KB Created: 2021-07-20 06:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85243c903ea15caec0e2c574def75172 SHA-1: 456d02d24c09ed666937df2a8254e16641ebde2a SHA-256: b5f7c5963301675ce2a19622f88cea747a0a57998088d68ddd31c94daecc6156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to obscure the ultimate destination and distribute phishing or malware payloads. No scripts were extracted from this sample, but the structure strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/7nju43pbllchfv6pfjjn4cm7a1/54809192195.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/farurag.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/48115046121.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/73630475110.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/33527776031.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/6e41grj1i06g05bhe72uoc48a9/rubowomopazi.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/dekusoxabiwe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae80bb11c---42832450155.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0068d4c32---mikotop.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52ad3e976a974542b23728066d494040/59586287629.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/suxozov.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9fdeaf257df04c84053058392ce149f0/susoxexufo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a3e30d2b---movomurosobasifu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d31930add33970f3b998b7b7517e02da/22044737046.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/12815748665.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/lazogerolopurilepadoj.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6c3eeaee275c663d39b7e97c8f724ce4/ziwexavurefiwi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745fb18a791---pafawifow.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/77974b5937f732ea23c72d17100afdc0/zejuvokiwuwewakizirozel.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/97986916607.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/kugemobuk.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/43793746968.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbbcd7b6c3---82545160864.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5384eedc036e77a96ac63cdaf3e492f6/firumabudefupibufix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manuales+users+pdfPDF 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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 10272 bytes
SHA-256: 8fab30adf501f00e7e24ab5a5d9f67a08bf3ca32c751d8e6d15a26a63a52948d
font_02_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 23796 bytes
SHA-256: 981a3a704d57d5ac06e3dbf36125f2c1e36482b947999b4ec594ae1105636385

Open this report in the interactive analyzer, or submit your own file for analysis.