Malicious PDF — malware analysis report

Static analysis result for SHA-256 3825cd4dfffcc368…

MALICIOUS

PDF

109.9 KB Created: 2021-09-17 15:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8fe2103e7f74ddc552988b66b9ea2fd9 SHA-1: 5ce5d129a73a9237b509ab18630dda9d0d7405d0 SHA-256: 3825cd4dfffcc36893b5bd12682be4454f42ccbd7b1ea63cc481851e90dbe83d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jordan.si/dokumenti/file/fuwiposoporanopop.pdf In PDF document text
    • http://pphjako.pl/userfiles/file/76613272482.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/67346241876.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/tagemopibabolabokilepivu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/32502442744.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/kevoz.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/99463163425.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8717fe7b---gefaxizomixi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dlol8juk05sfa8m8t1gsvlmhma/fuvixukuv.pdfIn PDF document text
    • http://dgkno.cn/upload/94642924883.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/79547970368.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ed82e8984---wubavaxexodimurijanas.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/61215920604.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50059317203.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/49273800634.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/lumafimotupagefojarikudi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/gagig.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/dugom.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/82824131432.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/fesenefupitifisaveti.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/vabovuvikusofinisakewaja.pdfIn PDF document text
    • http://gr-chem.com/upload/files/97805718826.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/nufulusikugipudotisu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/60649745169.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/69159333883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=time+warp+geronimo+stilton+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_off000147a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A1 18940 bytes
SHA-256: fe800a6c3aad285b3f645faa651c18deec02220529303272283a845bfd87934f
font_01_sfnt_off000178bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BF 10892 bytes
SHA-256: e02b3da6b6022dc419f9cdff0fb25a619a8029fee5c7dc5a19bc10e26cb76fbc
font_02_sfnt_off000191c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1