Malicious PDF — malware analysis report

Static analysis result for SHA-256 571e9196f03174e6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 01:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e73eda479fd4556fa46438667265d7a5 SHA-1: 103055f41f1ed45e32b7062fd11dbd1cf047bce1 SHA-256: 571e9196f03174e64b3bfd834428d903f8b49ade894df6a6be907b759b7efe51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crewmak.ru/uplcv?utm_term=track+my+phone+remote+call+recorder PDF link annotation
    • http://school19-zav.ru/userfiles/file/forebilowakajoxus.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/ratawofaxumo.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090814141483.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/42247091666.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/70539700986.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210901120825.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/gamiz.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021913529209397.pdfIn PDF document text
    • https://coil.hk/upload/files/suzedikidakujupeti.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90785704979.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/ferudagomi.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/2146979475.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161465a947afce---96208121058.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/kuxirimomuga.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/bifefunigodezida.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d62d1cba---21815481431.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e2553c44---nopasonaj.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109052246126030.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/jatemijinofig.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vaseditokuvimipa.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/29196383570.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161387a7c45ae1---bepetetisenuregavinif.pdfIn PDF document text
    • https://rotitelor.com/contents/files/nirebadaxopamolomideper.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/dulepebilatoneluxepafipo.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/bobaxavoguxif.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/14558655660.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xuxixebu.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 17980 bytes
SHA-256: 48af4838acbf3a5865f17641ecc87a8dc3ddf684f299836062715f24fb99ee5f
font_01_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 10688 bytes
SHA-256: 0952ee52017392c54a00f0a6d168909f06ceac27fc5722fc4cecf21f66f90668
font_02_sfnt_off0001315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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