Malicious PDF — malware analysis report

Static analysis result for SHA-256 647a25285e81f1f2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 18:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40cd265137ff53dc3a89f7181659a47d SHA-1: 762c19e1d48b14b80ad37c8fcd5e50812939ca71 SHA-256: 647a25285e81f1f2f774d8f67b5510a6a0e1ffb387fcd65dac8362f9045ea857
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the overall structure and URL findings point to a common tactic of using compromised sites to host malicious documents or redirect to them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=pubg+lite+mod PDF link annotation
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/89246279623.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/fomon.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/nowagazodupubekit.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/24207865954.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/mokogijinijibusali.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/pumenadojadebatosinume.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/28992959536.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/zukopisugi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b3e9420c---54765957333.pdfIn PDF document text
    • http://agro-partner.com/Image/files/59039743872.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/8486777834.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/doteragibumaridumitoru.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nimejilotesaki.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/71670142875.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/guwodeguv.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/somaripediniku.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/bejumosotut.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3892b3f254500d2462ecc1e677570b20/xopufosevi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614228e8dcda0---tezorovulu.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/78605995301.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c3e94a9f922f475423451cc0d11ff4e/62871017098.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/pusapodapetekepajovojez.pdfIn PDF document text
    • 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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16620 bytes
SHA-256: 8ce2ae2189b74129573cc310f7ff5a658472caa234c462421453f5c402ebbb26
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10296 bytes
SHA-256: a64367f568fa7118abff268c4f76b499a8881456b9ebf7901f450cd2e9f229df

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