Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde09360995b7484…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 04:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99c57da6e4c3f60e1bc42106df3e39ff SHA-1: e4a0a6c3118ef8a19a440a1055c8fa33949b4e88 SHA-256: cde09360995b7484f850123a4576cf534275331c0c9720f852739da0caf7f476
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting it's used for phishing or malware distribution. The heuristic 'SE_URGENCY_LURE' suggests the document may contain deceptive text to prompt user interaction, though the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ef86909f---lunoxujakef.pdf In PDF document text
    • https://drlanda.hu/user/file/refarasazirejarekon.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nuvak.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/bbaadf146e9fac53f9480e64b344f1d7/46611844343.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16081a63d65b2e---26739351271.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/texupemokozenevudirulip.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/38098428109.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/lepulilatizekixos.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/tufuligel.pdfIn PDF document text
    • http://tfforming.ru/d/files/vebotajeberovuribawu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9c6ojm2ha8bt1gmkc3hrg1dg35/89791501973.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/pegekevopezagag.pdfIn PDF document text
    • http://www.520amis.com/upload/files/jomizugawoxajalizazozi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tmaevojj1ibv1k164rsq0roant/fugisubejefuvaxibet.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210706_0D9EE3A73D77985B.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f4tqnbpkbt0ot8de0hnbb55utq/judoxoxaguwo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabbab1a106---bupetakoge.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/xelixoxufepimevepegofaj.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210705135750_1046619443.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1fc76e63---savusezadogu.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/34540263641.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/11b80cfa1f2de65ec106973929852bfe/tenafenizoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=class+4+sst+chapter+2+question+answerPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 17832 bytes
SHA-256: 2b81bb40a6a2c28906a51d34158fcdb66073a20197802c8f9b1381586e2bc1ad
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 11032 bytes
SHA-256: fb854ca2af57c0e1d59d751b226caaf708d71f8537929bf45016c473792c086a
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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