Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a5c2811beb0dbb…

MALICIOUS

PDF

89.6 KB Created: 2021-08-21 05:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a099d8430d90a6a77b348b6adc34ca6 SHA-1: 0fa1b9ab88c793124583fe3ce692b9164def371e SHA-256: 28a5c2811beb0dbb3bcef83032a1f885f0a467ff12a72f3e6b2f3890f84e820a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and numerous links to external URLs, many hosted on compromised or disposable domains. The heuristics indicate a link farm designed to redirect users to potentially malicious content, and ClamAV detection confirms its malicious nature. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=active+and+passive+voice+worksheets+high+school PDF link annotation
    • https://empezo.xyz/js/ckfinder/userfiles/files/54057970699.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/91271741202.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38c3e4bb1---1827840726.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/73446399462.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/lufisuwozumorufabibinu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/086cbe864c33d5b9c12ec7a9f8c31c1c/sudexinorowekupazewasigef.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4cea661f5e3078b22eac85ea02451508/migusijumidudugetujo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c995f911---10595856597.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gobutuzoguforu.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/83959b74c2f67f8173edd2aea895ed57/96599347779.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/56003411147.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hfqj08rcubu488tuhgtc4p974m/65711502191.pdfIn PDF document text
    • https://dacola.com/upload/files/26022865115.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qvoft2mi5u4m49thojdvhefhk2/35210203196.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/958daf289dc849e04b167592e59a4849/22489347130.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625551808.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/joronimogutisa.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607996b6e3af6---68200913224.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f013d240d8---nagokepurajukewapekopurok.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/letebudunojamo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/48868993291.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2afd1c18c---sobexojo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/41686715994.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c5238b6a---sugowevifariminudixozeli.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_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 11020 bytes
SHA-256: 056ea8e67cb63c8f32140a61a3504fd486d6fc41c1ffb19ba5e7a39714960194
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 17472 bytes
SHA-256: f96cfba890055720a1513f08266ed0afa3ba890f1d4a61921a7b3b7f1df91b4e

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