Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a064d7b814d21d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 20:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f336dc599a1ba24a029e68f7c4b96c0 SHA-1: d41bf7be6da22f6b39b66508a23460f208fa129c SHA-256: 83a064d7b814d21df11d3155984a562a2afc5c694f7ae47cb792b24b8b4b4ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://queure.ru/uplcv?utm_term=reported+speech+pdf+exercises+with+answers PDF link annotation
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/9322128845.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/lijedujevolamiduki.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7acc49736---53201423791.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/33969879187.pdfIn PDF document text
    • http://drtamerturan.com/file/kitebosod.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/22332896734.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/61067482788.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/pivedutawim.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/riluxomobosibi.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/27033591224.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/81340312726.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/kugivotometat.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/5915044235.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363fde80f4c---48265990013.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/94113f8d56091c55f030755b72cd6788/38242298222.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/zanukulepogefewokewis.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vusir.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/24845012090.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/50551318781.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/vefebapazep.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/7713196303.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/lazawa.pdfIn PDF document text
    • http://mp-journal.com/media/file/puzelukutaxurituwuwifizo.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/18522094810.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/94413832670.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/wozimuradavak.pdfIn PDF document text
    • http://unityproductions.com/upload/files/22948105223.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_off0000c39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39D 10904 bytes
SHA-256: 3f00fc734a6bcd04f3f196e165aed025ba42e408347338fab97fd5e6772c8ed5
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 16060 bytes
SHA-256: 95d845c6f3f5d7f41e5c0377830b0457324121f3ff1bd0371f3a80a5f1b69d1e

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