Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd73f39b3e43f1f…

MALICIOUS

PDF

97.8 KB Created: 2021-07-19 17:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d4855de50398e568cfe0c9dd825c4e1 SHA-1: 8fb2d37bbd44d0592dc7231ea8f13ea7c29b2db3 SHA-256: 4bd73f39b3e43f1f0b2901eb8ee73c1df7fcd3b8c577f081ff4c6f7796fbe31c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://cp-1.ru/userfiles/files/21297480753.pdf In PDF document text
    • http://bm-shower.com/userfiles/files/1067857791.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f48a190cd79db10ca42e28114564186b/tedaf.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/38113616615.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/lovaxelanoxiwegomogobasi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/o9ph214mmt7fak56m11ima21p2/zezenixipajevorujevapa.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pbm2do6qfd78flk4anb7oer1c5/55250875585.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/mamitubowigaludubi.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/bewopukebofi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/702fb3529a87b8f29ef6f2118b8143e9/83857049470.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/77126899775.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/70044968083.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/misexirojamowu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/89342605223.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/pukotuwolidetobogas.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/ramuxujefit.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8c39821c4eedea5f20b4eb86c5787121/vupitusep.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a87a12a92---15107811524.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f9963556---rijipetat.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/79338627717.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/giterajurasak.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9253c715fb80bac1d5498caf9684b1c7/sokukobenugugomunovim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nginx+upstream+prematurely+closed+connection+while+reading+response+header+from+upstreamPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 11444 bytes
SHA-256: 45ba7a8ab10a9c0fac7e5ea6b71ae4cd98b045d298031603415670241fe9b385
font_01_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 19044 bytes
SHA-256: 54197139ec9b1348995ba8adf132d7d08f57fc2511de5a68a2bddaa2a711f548
font_02_sfnt_off00014601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14601 7168 bytes
SHA-256: 404253cc9ce89fcef047ba09e14dca96cf7dbbf993348a85ae0cf48f7e469b43
font_03_sfnt_off00015dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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