Malicious PDF — malware analysis report

Static analysis result for SHA-256 7566a3700c17102e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 16:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99b6c904fd0ca0ea3dd896dd7992f056 SHA-1: 8c7c7005e4e3dbb7934af3edf76a79b6468223ee SHA-256: 7566a3700c17102e625d15378ee050e8b4ab57e2f8104ea0173d8d87a4db4a27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm. The primary URL suggests a lure for downloading an APK, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=download+tachiyomi+apk+free PDF link annotation
    • http://goldia.cz/data/file/5059452701.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k4n8dr1nntkqa6covm2e57mpl3/foxajel.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zejagudefa.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/47424905680.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/26080728614.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/bijudupese.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wepebi.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/62698452086.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ef595e2d---14300805851.pdfIn PDF document text
    • http://kbchina.de/upload/besugowiterusi.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/73783028767.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbaf58b98---sosazepe.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109060054111774.pdfIn PDF document text
    • http://guchen.ru/d/files/mozexuxoposodinadenakor.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/xaduxej.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/6658450969.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b11370439---96802404210.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/rekokuwaki.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/24959676305.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bofenudazol.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b64e1d5a1---wugiwimudolotituv.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/zodurenizeguxo.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/xarag.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/zewidikazomibuletuxo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613976ce1122c---42021335810.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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 11012 bytes
SHA-256: c57cabe4605e5331c4346b0d866f158e5b2f0b63ab6584f8454764ece20a58ad
font_02_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 17868 bytes
SHA-256: 511a9111e4b180bdda3d4cd5c4079198f3716b57778939ddcb8b3f5cc2c50c01

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