Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab39f4b76a7f834…

MALICIOUS

PDF

80.0 KB Created: 2021-08-13 01:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f8a9014a36c1ed6fe720d041e5b1da1 SHA-1: bbf0047aedb992b86719372121106a02c6fd122e SHA-256: 1ab39f4b76a7f834dab923a3f61b1ad6948b042911570acc2ed3198386ae2283
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/11c075e97cfbe20cd1b8d87ac1867f8b/87179443650.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161075990c4a1e---71846408823.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611545fce1180---58023126431.pdfIn PDF document text
    • https://patc.fr/imagesfile/78839630784.pdfIn PDF document text
    • http://pvvc.cz/files/jofin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607399e7e2a86---99046141424.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce37d04dd0---58397555689.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/55587436046.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b560575896f---xavirezagewigisituj.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/96890567108.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/15455901898.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce9f3cd02---wawuzumuxosisogotib.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/26197135296.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/20233377017.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085acb252824---vasuwotemixumegazukadigen.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210630172144.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6fc265b1ec03ca8f82dba66b971ff285/jowoxaki.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d22622600---16791207867.pdfIn PDF document text
    • http://bakoca.hu/files/file/57272200365.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jpe2n35m6pfpdljfkm5serhnk5/23470936570.pdfIn PDF document text
    • http://elitvorota.ru/f/file/41825295711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=libro+de+formacion+civica+y+etica+2+de+secundaria+contestado+2019PDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 11428 bytes
SHA-256: 3ba8beba2e6062a6c70b594a171228eb261614e15a20ed3da38a03a1ed7f13e5
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16780 bytes
SHA-256: 16d91cfe54035ee95974c74c04d053d954f85656bf1d78fc109e6296aa83b615
font_02_sfnt_off000117f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1