Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c1efb113e8948e…

MALICIOUS

PDF

106.8 KB Created: 2021-09-15 17:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd78107629114a146684d7e1629462b6 SHA-1: e026c1e970c11d725e4b22a81e815a66070f2696 SHA-256: 97c1efb113e8948e22e6dd294e198d6db600177a43b945be604e6f0f394fcae0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://puzynowska-kancelaria.com/userfiles/file/nenafaba.pdf In PDF document text
    • http://luluscafeonline.com/uploads/files/84703265915.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/bomamoxov.pdfIn PDF document text
    • https://ismart99.net/upload/files/robojukulimoxub.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/boitv6hdh9usg74gc0blbc23oh/41409503903.pdfIn PDF document text
    • http://specialcats.nl/media/files/mifuvoxusu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7e48d8afff95fc09c881c494264bafd0/jepadunizib.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/ripuniluf.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613430c678d3c---14427513628.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409024a3322---50576753090.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/japavufapirununeri.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/punegep.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/zuxoxugodepofuka.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/96789031009.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/danobepapew.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/senanibajoxesexa.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/logapewukoj.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/18057791999.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/nerufidelixoxidikebugofu.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/81710384273.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/86058252109.pdfIn PDF document text
    • http://showdoimovel.com/files/files/45049883481.pdfIn PDF document text
    • http://www.toptehnik.si/images/vamegitevejoz.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/senerunasepumopalejusajul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ide+aplikasi+android+untuk+skripsiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10528 bytes
SHA-256: ed2355a737e4c86723b2ee5d855ee2f02c45fba590e92d310b29397b74b22414
font_01_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 16972 bytes
SHA-256: 5860e3bed7804c101735fdded14ea0372a27ed6ed66dde96481057e980898de8
font_02_sfnt_off00016eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000186c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186C4 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855