Malicious PDF — malware analysis report

Static analysis result for SHA-256 58005fb839418bfe…

MALICIOUS

PDF

92.4 KB Created: 2021-09-07 08:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d19784369c5cac7793546f9e4ef821b SHA-1: 1596eac360867a9fa3fedb3f414c9f7b2bd64689 SHA-256: 58005fb839418bfef545d458f0d0e6f0fa795ba129c018998e147c85adc63edf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=examination+obstetrics+and+gynaecology+pdf PDF link annotation
    • http://bclgrouptt.com/userfiles/file/morovoru.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc96c2129---gufufis.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210606231042.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a74ac0b2fe07000e9d3ea305d7f53532/gidulekilati.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f04c8673f---sudijulufuromumutekuto.pdfIn PDF document text
    • https://bem-sa.com/img/file/lasupazenixifusimabebapej.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/nodulurobogomobos.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/xorixalivebufa.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/9509174029.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780e3eb11e0---26081160602.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jofesipanabuziga.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/509sq32k1u6rdjhfmops48lhi4/gesuwiwawokuropatez.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tibomi.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/zozalefoxal.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/nrvg3souhtq3vq89vaaa3ch7n2/62717528561.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a01cf0c246d5f6067e51718e837b98f5/zojugazofelerawuvawu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/vilisile.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lugukajepagipefax.pdfIn PDF document text
    • http://sushi-belovo.ru/files/60355371927.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/83df486beb28e521af5779b6042fd22a/fukubekelutidizenu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/24849856136.pdfIn PDF document text
    • https://mkontroll.hu/File/naziwon.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/bb316d3e57e616607891aaaf88c4ecee/tazaxadakeweded.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/lewudiraze.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_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 11300 bytes
SHA-256: 41412fb3ce6c6464330e71427d558892c2271cd2ac2c2cb67ea4577f8afb703b
font_01_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 19852 bytes
SHA-256: acd35ed426c24f5d6ae970201af999cf012ca8cc112df3cd2b27f4a0900d4dfa
font_02_sfnt_off00014ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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