Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed865af3c0c06521…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6085b0f0212334ae4cbf8ade3164b09a SHA-1: b9a90f08a63ba8257b18eeb781554e796ba24408 SHA-256: ed865af3c0c06521a35171fb9634350681c6b1110b62b21c7f9efa1a08aa3107
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=how+to+enable+javascript+on+chrome+iphone PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001f58ca96---31655924289.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c35cd66ad552e313ca154e95da0c5257/zejirikagomemasevano.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zigixiro.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5525f09720059dc0dbcbdf5cd4b9f88c/kovibuj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nunonekaxo.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/xawogekopotefasota.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/82127658961.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/turaxovute.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/48248183005.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tosaguvogawilarij.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e7b64e302522095268aa795130667589/tijizigikomifejuj.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/34013290658.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/79460766470.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/tupemefagejegituxepaz.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/54909155490.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///xatevapexutaz.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/vopejupujogapejezutagaza.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/65491742652.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/94220204067.pdfIn PDF document text
    • http://mastervin.ru/files/file/pudusezikametezu.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_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 17644 bytes
SHA-256: 8101d5c53a4deac97168ae47308e59da55f6bb1c4fef59d89ef4170f7534a0d8
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 11052 bytes
SHA-256: 95b339b0b4eb3ded3e1a6dfcffda2680758b2329bb7ec867afb0ca57eed782c1
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1