Malicious PDF — malware analysis report

Static analysis result for SHA-256 7570e06476b6a446…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 16:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9480e36e560ba60612065de2fa39cbb5 SHA-1: 41c5ee03ac1dccfe7df58d0b4b5fe7042778537a SHA-256: 7570e06476b6a44649ef7c70f7672a08b5a29057f9200f70e5cf0cf830eddbdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to websites hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://werkschoenenverkoop.nl/images/docman/files/fuzimikewaxamubujutus.pdf In PDF document text
    • http://techbis.pl/files/file/gotivewigabibe.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/27540022508.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/71043964571.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec99230f71---tekegegetevawuxotupufa.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/67678781840.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d34cc436485---budotomesawisipadorovixuv.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/digotasilibugixivilo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a7da7a0d---wisasitije.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/rizovuletebenelurila.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/294bd75c441e92ee502f32c134d6e64b/17333903422.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/pujomoze.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/69ae6522511994d0b53bf105bae1829c/takeduweniwivunariba.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5e4768dbaae3aa5af8a723513e58f163/puzadepuviru.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce6d2795a---fimozopup.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vbb1a6nm7hnk16s9nl6mb7npif/kisedadu.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/91955484188.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/migigedemibupa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1829c60d1fa0d2f175c6642e00842ba7/sunuvasorunikavalo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c061685cbcc---gonesigopu.pdfIn PDF document text
    • https://equalland.com/uploads/File/tenogasofenesuvesovovuzer.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/lejaxuvotuputezaz.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/jigobosudisovazefebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=declaration+of+helsinki+2008+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 11260 bytes
SHA-256: c034c2e0718eff430ce4bd77ad4bc36b737338b9097027742a15d0efe5801352
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17668 bytes
SHA-256: 1ee43230475e1535af39d288f1f0932c01a100f3988423fbbf2ccc7e85380a97
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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