Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df8103e7fe33f5b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 22:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6df877c5d4548420ad272e9c5c28f37 SHA-1: d9fcb45e3d59a105d764288fec09a4815bd01dc4 SHA-256: 1df8103e7fe33f5babca78bbc9c149b6d69f30b002da3d30deb6e238a833d76a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://biharlokmanch.org/userfiles/file/kakuritaduxini.pdf In PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/fixasakupopexatosikif.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/87718261646.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/58101405408.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/53995466745.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/17278989438.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/97383514358.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/texalojulewajojajuj.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/56106669893.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91a6a107d---49556355756.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/kapewivibujuvafulabe.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/buzenu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2erne8qjovd9jd9g53pdl1e08p/nizavefutibigemaj.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/keweluzuvijomokax.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373f08f3afe---vesikokegalutidofelin.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/womev.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/96493007805.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/52954416867.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/90907448332.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/lokakupepumubav.pdfIn PDF document text
    • http://e-hematologica.com/users/file/51911194391.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/17845962970.pdfIn PDF document text
    • https://strechybenesov.cz/content/nadalukipofavox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mha+season+1+ep+2PDF 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_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 19952 bytes
SHA-256: 72024013ab5df01b5a9165f4a6fbb8f57f698e32f8b992a58ba4e27bf0d707fd
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10180 bytes
SHA-256: 89cacd18c6c3b2b4fdb070384316d02cb975928b016a5b4a2c8d86bc43a07afd
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1