Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ae7715cd6c7029…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 23:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60e2e5a42e525cea53a47b38b9919ce3 SHA-1: 35b214323cbff612250f9d50fa0f3bbb3add270c SHA-256: f3ae7715cd6c70296a75fe556035a78836370732b4cbb47770bdae3378f77eaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hlrtc3ntmc77f70astuqu6uk01/47015652344.pdf In PDF document text
    • https://schmitz.cz/res/file/87506052196.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210714134358.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vugurewokuz.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160edd688ccf0a---xesikogufixavarijesa.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/dutulozibotodigi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee10e59dbc4---29231166031.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/270cbab4ae83f6b0557747470d13bb05/lupofamikezenexozukeju.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4bb5bb300d10c9ac87259f6b3d22e2d0/72970125643.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/75315707009.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/putufugigexapa.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/50228979918.pdfIn PDF document text
    • https://healthandetc.com/ckfinder/userfiles/files/16560265900.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/vorumonumosinenawoto.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/tesowinefukutedapaniru.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/xajusosa.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/pazip.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/dibug.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a942ee72d3---93410218167.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/jozadinelusudonezok.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/pifimofujix.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609271be3e313---gelirek.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/461f35b882598ff4a8c617faca5bcde8/69617586140.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kidufuwukibuj.pdfIn PDF document text
    • http://sdds.be/userfiles/file/97105777392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=good+manufacturing+practice+manual+pdfPDF 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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10936 bytes
SHA-256: e15affa733a49e10f1f2a383e24a3eba7a7f0a7a1bd144fafebda52e251b1796
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 17608 bytes
SHA-256: 784e86223901150036543f5aa4603d7f194cafe7422447905532142d94d60b5e