Malicious PDF — malware analysis report

Static analysis result for SHA-256 5258f66467e4ab0f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 20:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d052090741243a959a27e9604f6c8d30 SHA-1: 7b62dbd3081778834b85653252adea6f65d493ab SHA-256: 5258f66467e4ab0f5167ea66905f34fb27fcd3f39d76e682842a64fce4f303ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=spontaneous+magnetization+pdf PDF link annotation
    • http://abwcrainhwy.com/uploads/files/kijuvoxijozukamiz.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/zezubezuv.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611091a1d23f3---84540348746.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/fanafurojexebog.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c05ac8a739f067421450d3440f50afab/riwomupovexutafalum.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/45994298962.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d7187a48ad9285a651e1c7a9500f0dff/sibadavoguxagutumuzoxexid.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/kcgn0tij0dp11gl8s6rsuai78b/lumukeza.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ig1fdq9fgqr9hg2phg7a4b3e8i/difurafesujerawozizem.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/sklv25dmr5vm0co48isah3ii2r/pujur.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/xujimapodemopupemar.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/14651233378.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160707aed63a2e---zamojid.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1ff3be9d---guxifarerobawapajeda.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/48070461503.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/netavejopedupinafa.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/vaxixosisobavigo.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/15647986119.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/11231746966.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/28933614961.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/36510880160.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/93569589547.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16109c31c8da6b---lesajolimosakelusopog.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_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10928 bytes
SHA-256: 6f828e76d1774ec6840a23b7c8759efa341357820c6b0ffd4353a84fe08b07f3
font_01_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 17324 bytes
SHA-256: 5079ce1120ae68fe680ad91f29edab20ec090dde2bddb4041c48a5c3bad02387
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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