Malicious PDF — malware analysis report

Static analysis result for SHA-256 06426943d592b49b…

MALICIOUS

PDF

84.2 KB Created: 2021-08-18 15:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94aa8fdb28eb55cfe52b1fec566deae8 SHA-1: 3b6b8d07e8d3d55bcf971828ab1f2cbcfab2a61c SHA-256: 06426943d592b49ba2830877b77ef3f26f512e823c6549bb553d0f3bceb39a25
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=twilight+4+full+movie+in+hindi+free+download PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f90e6ed0---solomaxisototetabepulefu.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/94103332281.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/19377959211.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xakibirotajogukos.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/666918227.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/15938057873.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/39276020813.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/defelulizexosubu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ijlo8enceum7n9np1plamv8fk6/buwusivenowosojenav.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/witosejegirubu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///81883863879.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b590c9706---milunogojifod.pdfIn PDF document text
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/vapaduridiporidukixaw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b2021de7e---nepowevazuredim.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210614_CA47F6D241C70519.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/47266010956.pdfIn PDF document text
    • http://ponyomaru.com/files/files/11018501217.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/mopejalufinekoporatarif.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/favuke.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/39732012140.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/natadenojupojixi.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bufelisefuje.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gosadigepiri.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/61742021662.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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 10928 bytes
SHA-256: 43ba72d6f2036a7839b7c652615bbe8f85896284baf555ce3665ec773259fabf
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 17072 bytes
SHA-256: 4b774d71c19b857c184d7f7c7ecb2217877e2231033061652410d9ffb86bfdfb