Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce4fa0ca0389c8b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 18:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fc4b14d03e7e1fafe4d4763b0e92737 SHA-1: 48ec342aef9272b7c640bf84cd0f27b10c02dbf0 SHA-256: dce4fa0ca0389c8be3a3a4a069fb5427a8ae4d7f2680e61f64bc41886c8c0eb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely for phishing or malware delivery. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drafthe.ru/uplcv?utm_term=iphone+6s+price+without+contract PDF link annotation
    • https://self-storage.sg/images/uploadedimages/file/semovotebivisabalotida.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/3856303668.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614451ad5ba32---78094706803.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/rataro.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/93262056710.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/57735215277.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/nunosamu.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/77285150644.pdfIn PDF document text
    • http://bulmarconsult.com/files/kipugasamuzova.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/99fd112a92c938a8ba7d916c72df33ac/58736696417.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901112539147694dm27esjs0r7f.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/mexakubatupidasizur.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/68925518588.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/57141218704.pdfIn PDF document text
    • http://gaudi.tw/upload/files/9444771127.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/80ede388b55eabc2ff5df58589f80923/12144793664.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wadevakixutus.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/kesenuva.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/74450194732.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/pavaxuxelimufufib.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/88fa49e66b9ff3daf4f691402eaa615a/wakopewozu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146008abe069---vawuxeti.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/pisufeluxikixowejagave.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/61917995707.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_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10728 bytes
SHA-256: afed09f769e6aa5dc581d7851fcfd9714d6e44485dbc4812e16f57a41a8ba41b
font_02_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 18416 bytes
SHA-256: 582c661c939d7f8b13b709be8deaa95b7910732eff84c62eccf4ad96a6c8e2cd

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