Malicious PDF — malware analysis report

Static analysis result for SHA-256 d398e485eacf62c3…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 04:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a89b1845a7c74580b8c6a75daa8b215 SHA-1: d3990755b2c16b06295c31d9040d76f9d29106fd SHA-256: d398e485eacf62c3f3a8c57890a52365781f2e767e3c3761b99b1ba5e536868f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://canadianrockies.ca/files/file/vorebupinofexikor.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/2655119932.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/jujaz.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tegevamo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/aldig8qjnpdi2d2jfn89t8j5i0/66413113759.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sivariwewujopuxetiwuziso.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/varepososizigefukima.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/20/file/20210520_202231_117.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/60718052845.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f92c4f988a5---mesinov.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/balewapotutekuxavufipur.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/22010966534.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/17095038880.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/dcd079cced664ec0be690e8c74aa92ea/96634507899.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4es1df4sh52smkl7av9oltj2o/41061315860.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/lolavirokemulekitanazufi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608490a9d64fc---26932628978.pdfIn PDF document text
    • http://3asoft.vn/img/files/timofosesip.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pilof.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/febezapuxaxinewo.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/35524822762.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/88617126985.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/xagob.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/31924864405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=companies+act+2013+book+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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 16196 bytes
SHA-256: 101d5614c63e5f185765831e60b9e570126a54989568dda6698d6605ec275fe9
font_02_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 11364 bytes
SHA-256: dbfb42cb5046bf8230b021bbeab8a604e69b7959994ff50e341854ab87f4c180