Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfdc436d78974b1…

MALICIOUS

PDF

103.8 KB Created: 2021-06-24 07:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ce90973868efc06e3d914921c973b634 SHA-1: fd4edc5b9adeb26cc3dfe7d5da3f15eb154669ed SHA-256: 1dfdc436d78974b1572af581ff11f87820af72591eb470d42654693dfd86babb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely exploits a PDF vulnerability to redirect the user to one of the listed URLs, which could then serve a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://huntic.ru/uplcv?utm_term=insight+books+pdf PDF link annotation
    • https://ckmandarin.com/uploads/7562634786.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4rpsm9nmapuksi6v4j770s7q7v/felinuvimotuvilinogid.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cdcea1d58---99502615856.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/i9bsavvrkcuqkvdn2kum6ckeu0/dipodira.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/149c6c2701ab20daf14891cf0cea1c45/midonixav.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826ad55ddc4---nafaxegiwurisu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087101580ec0---tasagadibewalodabavagamo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/dunazamugopawofegakikose.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c7589f305daf353c25d2d42f7766d64e/bokevol.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/zaruxotej1620811963.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8u5hcnieudppucpt2nhq39l4n2/wumikewe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ade6264eed66d6b3b62464233921bb16/36165592942.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pisimasuginudujisu.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/73116312308.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a6a6c2a5fa1b1c16e1e48e762128fcc1/wonafesobe.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/86h63ocg9glmj4clclukt2afnj/dawujevikum.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/runusuxelezituloreluf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F2 5108 bytes
SHA-256: 3efb3d93fd6455712c6e8ca481335c0990f864b69192b4febd6739eeb3e8cd36
font_01_sfnt_off00016b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B52 11472 bytes
SHA-256: 2b2bef01f099da199bf08a7b4cc3808718582d452f403e23ab78c776fa9630bd