Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe25fc89536a2ff5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 12:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efd0715be4855d1592bfa03c9162ed60 SHA-1: 6e110b53e3f01ec38c8d93a2d928a9561c62ae18 SHA-256: fe25fc89536a2ff525c99b0e279352f0d68336bdcf44818d5d8f43fb040de666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate that the PDF acts as a link farm, pointing to various external URLs, some of which are hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

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 http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/saziwupatoxexonozudulis.pdf In PDF document text
    • https://makanbanyak.net/contents/files/bagifowijadadaxuk.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/tezijupaninapoled.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/miran.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nha2b7cfbreflk62fndk0c0lq5/9839238962.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/dazitobazijinexomogov.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/59049628085.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/tofakenar.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/57968894547.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/35441111266.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7e6dg965fmgv83krbh6bsfejpn/xajenokugozukulilifaporoz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/moikdb7anu7o7gc8e24j8ogqs8/47705379795.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/razeruk.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/biresidalaxaferategu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1uojpll6be4dpmj5qsfkn9uvu1/juxugupara.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/rikotomexiforat.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d480a61ef24---30658294519.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c51ccf183a9b4f558a5bd65e95d7046c/zazozino.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097b99f7456c---82899583728.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/82217160113.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/dakerezeb.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b470436df---jizikizoxosa.pdfIn PDF document text
    • http://myredm.ru/uploads/file/givunogesulonebakep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=computer+science+course+outline+pdfPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/jawufepiwosadujitew.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 16952 bytes
SHA-256: 0664b0845f8cb14eaa6813f4338170227b488d4c3b50dfa00d11620e68f7824e
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10748 bytes
SHA-256: bef58b5c33d210d2286e8c4bfc530755ca9701f71aae46de998ed98c56a38950
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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