Malicious PDF — malware analysis report

Static analysis result for SHA-256 1532d95cd7e7965e…

MALICIOUS

PDF

84.2 KB Created: 2021-10-06 21:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 794f3639444912cd12e89224ab202753 SHA-1: 5acca446654a26773e397bb660278a800079b707 SHA-256: 1532d95cd7e7965e62f3af675514cb914f8ca744f403c24efa2226b763c6c071
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://infrive.ru/uplcv?utm_term=the+river+wild PDF link annotation
    • http://wmu24.ru/media/file/nugozefosegexexamojunil.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dolujakatatamelosal.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/91059439213.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/wafikepifa.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/19144703896.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161423417cf6a4---geletoxoxire.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b24f5e495---xiloxawimi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/kedibigigepirasin.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/finaxasujez.pdfIn PDF document text
    • http://japhina.com/upload/file/26213521632.pdfIn PDF document text
    • http://dsagco.com/Upload/file/pipibubeb.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/zavobamag.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/25829013711.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/gatatovapu.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rilapozosimotajemufu.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41471259507.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/genekerenuvikosa.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/sodikefiga.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/93832174596.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/zapifuxelenawitutugefabol.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602ab2edc9---17342593357.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/taroneselujararidupaxe.pdfIn PDF document text
    • https://pellevah.com/upload/files/bovipajo.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/nabimewetedosofavilifiro.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/8060324518.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/90748229640.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 18716 bytes
SHA-256: faead4346250f66bd64fb22da132c551a6c462ff4754a1f20165e537f79c5ace
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 9808 bytes
SHA-256: cd5689f73909fb4222da866aacece5e74d7288ed8ca0a3c620560b88bb7fe0c7

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