Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cb19b6c3d65b1f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 07:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0f8513053de748f17eb73f6f0a02c39 SHA-1: ce0fe6772318ef1ac3420f89b756b1ccf82664bb SHA-256: 65cb19b6c3d65b1f033802bdfb563f86d5abc51a3b4bbbf8917513cf33355f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/41083633446.pdf In PDF document text
    • http://105chers.netsociality.com/upload/files/42715648584.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc2fdf5de---taligejixel.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/15199830846.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/36272530264.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead83ba9c5---votofoze.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_21F3932A3A8D257A.pdfIn PDF document text
    • http://soc-in.com/data/media/files/49977632947.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/medufinedobo.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/niwudufuzimizera.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/lugupukanov.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139514c18eac---fuwibemobolofoteduwiri.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/79688404503.pdfIn PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/39812031158.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/fofalebugufoxaxigisiwe.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/xagadosudikugedekuzav.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/difoduzakuwi.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///21784422849.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kufetewapivitenakuwe.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/75546765131.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/getejef.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/9196973459.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109092332207633.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xuzidonorabugeriwogipaxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+iphone+data+is+not+workingPDF 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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 18648 bytes
SHA-256: 8e3eb0752289c7fa512c46949e1ed9f6f40afcd92c80d3fb82b4db2386678612
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10912 bytes
SHA-256: 828b0ea020dbc92e1af3d33d8166820d9fea2515b331c5150b1570b8c29e9cf1