Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284d88febf2bf56…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 19:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d041a21d38a3e9cf472b28e2f614a9ef SHA-1: 74abce56e0f257c1fb78b201d17a715024a60efa SHA-256: 4284d88febf2bf56e87ddf78e770dffe87094d677881a8fdff538f33929a056f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://we2meeting.com/ckfinder/userfiles/publics/files/tenoloxulazepurabafewu.pdf In PDF document text
    • http://pandoraecza.com/genelresimler/file/mosegatezatotidika.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/mefuwuwovirisaroloxe.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jowomalapon.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vipumabelufenu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eff339ebd5a6f94c4a446cd46859043a/73795195824.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51ecf3b60---watore.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/33729055877.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/98476906575.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/genowarati.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/56122901689.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/eb7fd6c5bf9ec46ccbc26b5df92c212e/30918076802.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/15383878546.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210917125203.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/72648827593.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/40734492434.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f749d3a03edf80915cb10886104920d6/93914767076.pdfIn PDF document text
    • https://uangraja.com/contents/files/43690889335.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mosasak.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/kipagulodo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/36301483363.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/16097483727.pdfIn PDF document text
    • https://pcetravel.com/files/file/16633881341.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/dupivupumopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=where+does+android+app+store+dataPDF link annotation
    • 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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 17084 bytes
SHA-256: 372bf9312109f3f457244253825e4bc3067b1acf5284911df156b4174c13a6aa
font_02_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 10436 bytes
SHA-256: 00054a7e1944bfe13779bc3e17314b5a37693d9c62ff29eb14fc237afa92ab8a

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