Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcef978a90d96f4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 23:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e74526ec1da4dedefac3ad717c0a0cb0 SHA-1: 25ecdc012979eb0c303a1cf76feb188c6ff2e1e7 SHA-256: fbcef978a90d96f4a657d4f89e8c251cac2872c3459af2d8ac15fca3c5b1ae64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on distinct hosts, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 http://cokhilegia.com/upload/files/76416211224.pdf In PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/96654433589.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/xusixozatovidejedav.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/71007130369.pdfIn PDF document text
    • https://flyags.com/editorResources/file///11232147589.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/59935303673.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/53435666078.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/netogekowunenawuva.pdfIn PDF document text
    • https://n-tlg.com/files/file/21105302352.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130645891f6f---jujulewo.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/26397848319.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/74234608751.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/52382312123.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6aacdcf1bc36fb7a10c080dd82518019/vajexopesagalixebuxo.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jigixubetefivux.pdfIn PDF document text
    • https://thehouseproduction.net/file/85970286836.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/mubopu.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109130557054304.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/3110275503.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/diraj.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3921af0e649762b40d1806ab460fa9af/95595389494.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/gevirejomobaditufise.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dagapibiwezakupo.pdfIn PDF document text
    • http://rhondachem.com/d/files/24424209121.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/rurokowilurasusefod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=inotia+4+hack+gemPDF 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 18136 bytes
SHA-256: c1b001b51745c0ba0a5fbbae1603992ddc8dea2a0f2b1ed4d73ab6fee4331fe9
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10484 bytes
SHA-256: 346599db9807a7cea689f236d99315c9bdd49af8a714d40617dd616e368aaa58
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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