Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beb1a8792f577db…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0df77cff60858e1f54387d66e96b5477 SHA-1: e3a9bfb5fe41989a5a01d3c0213ed88ba09b38dc SHA-256: 8beb1a8792f577db966ce25041c52636a0a6c6efa7d73223919e17eaac8109dc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The use of link farms on potentially compromised infrastructure is a common tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/arjjd0i6vghuc7p5ir35eav9nh/32930849350.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/zavixelavugepi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/72127669910.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/zifiwukorarewadojaliweli.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/61040239937.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9e67e1871ac219b7b539067e6d1a8864/vusewanufujinobinujej.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50400b72a3c0ba8104b309a2746e8971/49013741791.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/19039842475.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/49584d993c8e4424319d09280d291d05/98867919163.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e94c79d53---55829491520.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/94452593074.pdfIn PDF document text
    • http://chikatere.com/Upload/files/91352137395.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e4eec379e862546d25d599cb5a3bbe32/zoxoxukamux.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2db0f32f9---vufinawaxularulefi.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/34524280278.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/80380747069.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/19370741189.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f8b9615d---bulesupoxediraluwotolog.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607883750e67a---81717173994.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cce6eee2da---roxejelevekesawukun.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/83925973576.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4bc09ec1---salenazegetamazijolu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/69156717507.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/5922321006.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/88458670678.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/aajfturqmv4nooarbleh1ha5g2/vamavojususonekejafozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=needless+casualties+of+war+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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 10672 bytes
SHA-256: 6b379366f979ae49ac72d12bbc2992139b5005e21ba4656914a197f407d63557
font_01_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 16552 bytes
SHA-256: 9801b7f51a79d3db15c91fccf4748e751c1460ef2e49aa1c949d9c8225c91a26
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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