Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55c4cd6e54c7659…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 15:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e46a164508bdc50248ea23516fcac0a SHA-1: 6f54a0ad8233d8cf91482113effed3b6d866ba38 SHA-256: c55c4cd6e54c7659210f04ec3be7e2c72072b9c342277817223ffb3dbdba7870
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to harmful content. The embedded JavaScript is a common technique for executing malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=what+is+fire+tv+player+on+firestick PDF link annotation
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/sf99ec6r7eck13688spm9v156e/zakuvilaxozaba.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/xupatiwazud.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/p4u0mcf83v598891qfo1dk2pg9/57383654302.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/60346647237.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/69830861188.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///vexuzijeganodixelupu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/4628111615.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/82602813117.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/fofifufutuzelopo.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/fomumodagikakumu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ok5eu4qph58boinj7ovk2slumm/wibetonuke.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/15185760585.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/35363881337.pdfIn PDF document text
    • http://mamitobe.ru/files/file/12756227707.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/45617728053.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/15gf1cf81uvqn765uoavdc9ljf/27342912888.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/81192769496.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/batopefemebikixodulagola.pdfIn PDF document text
    • http://one9five.com/userfiles/files/24872103927.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/55350534647.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/fofamasodew.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazisijobusutesexuba.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/suposo.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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 10840 bytes
SHA-256: cda591d05272742e4b9638747037e3e9a1d433c34c41eba00056c4c41d75b50a
font_01_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16588 bytes
SHA-256: 0988c1649e60c00dadeab9286f74dd6e39123dde43e7aff1c9f1725011af3153

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