Malicious PDF — malware analysis report

Static analysis result for SHA-256 70111da4e2677c28…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 14:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 253e373a366cf675d7ad2cd0bf17233e SHA-1: c470b4797c91bd71402488bbe8e4e8bbe27a3bd0 SHA-256: 70111da4e2677c28d7d2d9cd71cb3df620c97437eceba645e3fcbbca30c76d8d
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to lure users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

Heuristics 5

  • 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
  • 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://neo-net.info/giganet/files/file/27283700751.pdf In PDF document text
    • http://szigmetal.hu/editor_up/vuranejisefaxudowisolidot.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/8951679542.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/35112913423.pdfIn PDF document text
    • http://rentaruedas.com/files/others/80802741055.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/merewekakuvejopuz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130d834475f2---waranarorakovivefubup.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/19311057890.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/79993613181.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/fonigipalabesageserokatur.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/70867903594.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/8591069148.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/9874068524.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/gigibetu.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/69874885411.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pivibofewexatewev.pdfIn PDF document text
    • http://panteres.com/files/files/legub.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161379cda5f2f9---62782786490.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/14433132776.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/9516445539.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/bowodubimosizi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0932fbe847572eead4eb9763a768cbe1/13119859444.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/66556307162.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/vegojexi.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/13272786734.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631142981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+long+walk+to+the+water+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 17684 bytes
SHA-256: aa432ef48a647c357e75cda533b9cf7e48efad90e7105eca66a5b2fa8f20b888
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1