Malicious PDF — malware analysis report

Static analysis result for SHA-256 f267287b83e53557…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 18:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3dc791d12425332443c257c54c4ef50 SHA-1: f2390898c05eaddba0f8a15d4e58d50ef0c0744a SHA-256: f267287b83e53557b28d80bd1d0115bdd93cdc133ce21696173d1d34af3ae817
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.facyt.com.ar/ckfinder/userfiles/files/7938942813.pdf In PDF document text
    • http://donghotam.com/luutru/files/2006069984.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902214716_xrcx20.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/84513643492.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/jerasalirapevuvolilu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a207a6950ff22be0914ef3c5a5ce76d4/maworoxaturidurogununariz.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/081420085615.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/fikuk.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/4606716985.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/2977563293.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zujakidaboluwonimo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0c6074fd3b7160a60268dc03af236f49/98098067467.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/zenexuvebovikibej.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/28460788616.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/62951299038.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/46075693648.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/jivaseda.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb1621f3f---84016345415.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109012337508570.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/31029435297.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109130236488786.pdfIn PDF document text
    • http://njchemland.com/upload/files/33749221397.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/09/19898544136.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/29985904708.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wabalolidizit.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dosowef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=parche+de+seguridad+androidPDF 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 18032 bytes
SHA-256: fe26c67195d0fc7c0f353127763296313f7a7b1f78cd5a019faf835105797af3
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 10604 bytes
SHA-256: f85f340b77df063bb2cbb852c09be7d06c4e3713d4744d5424d3773f874bf834