Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5953464160e7ba9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 09:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2b1a7773284b2b3445577cbfd27d7cd SHA-1: 555b8aac29dceb98abf55f4b10148010cb0227e9 SHA-256: c5953464160e7ba99b493a6a0ec0d1d002b7253bf30dd83921994e4a1f02caad
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns are consistent with efforts to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=electrolux+insight+gas+cooker+manual PDF link annotation
    • https://bisnismedsos.com/userfiles/file/30863597842.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f586c5df2b---96597212343.pdfPDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567b705dda---70289107300.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071b19d1a94a---68027861765.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zijojolotefojifererepave.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f4et976ddjilqs6jpt7b7949l4/muvozorazadij.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/edac43e5f2704f4f1bbc065f63c1f715/somazilirotasekujaseguje.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/77701717631.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/fepozenomo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/60002073605.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f115b5dc7349a19154318b4b1c452a43/wifobom.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/liwizadunasuzeduvewez.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ggedlcrkb6316t8ej8ggtahk93/loduxuruwojopopavuzojosu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7fc07369---1161809581.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c20d3e8d---jogaxosalizusotolaneje.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/maniforobuxawo.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/64042589201.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/261799b2f90a3943e39538ee44492705/96131451565.pdfIn PDF document text
    • https://ikima.fr/uploads/file/14911324576.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d5e0203ce8009f20b29379b29da6b6cb/dulosidekisevesejelew.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_off0000c3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CC 10952 bytes
SHA-256: 32387047bb8fde5c30d6a785eef58a8d22995294f7e97f371fe8d888bba027f1
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 17120 bytes
SHA-256: d1ef516571b37b3fdf23170cc3d8c749661d7f91ae4e07bfa54f2245be1e836e

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