Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff27faa6cd49917d…

MALICIOUS

PDF

108.2 KB Created: 2021-07-31 18:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 29e6f447e735e05f8f2e602d5a525aef SHA-1: 718037dfd4b82ce6412e3894522112cfae71fcf3 SHA-256: ff27faa6cd49917d8b9fd4166bfdee756665a40466007cff75234c5520ad67a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting. This suggests the document is designed to redirect users to malicious or phishing content, likely as a spearphishing attachment. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=flora+y+fauna+de+la+delegaci%C3%B3n+gustavo+a+madero PDF link annotation
    • http://prochem.vn/images/uploads/files/93392701497.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/36899938243.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0c445445d7c394c5670431f684be9c53/80741757552.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ik03v48spvabd2vrr8337gtprq/resanogisivamimifani.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/40a57730f30eecab4d1379b26690465d/25336152191.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/karevubolitixu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d19388ce48931a1efdd8305be8d4da39/gaxonavujepiligav.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/36200388872.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8b863e4434a9d01bd75a8045cfee4e7a/rotimawajonekebugom.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/tapiwesisimujozabazadam.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/42366766960.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/l60qksbt706u72pquebii045a7/99369648688.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/wuzuwoxukafizupu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7093bc7882---84403904068.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd4735094---64341816000.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7189409240045d40ac838bf878122c43/6875830138.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6465ecb55---75623080490.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/33221802350.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/54a9cdfbd566125f346c3ea7eeee98ba/mibemiremokemebosoxasemo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcb7e2e1e6602c3f635e11b57f4bbc63/gojofatuvarogu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/36b65897397b27b852cac2d057dd3199/29358067211.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_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 11212 bytes
SHA-256: bc4578bb728705aefebf7cc70dcf83403bf96869b1a1ffe3e6a8d039be8bea93
font_01_sfnt_off00015958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15958 18220 bytes
SHA-256: 11c0fa328a54e1f50c705bb7574e4ebf6a64f979bfb74ef4d09c5987372638b0
font_02_sfnt_off0001877d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1877D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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