Malicious PDF — malware analysis report

Static analysis result for SHA-256 3122e8e2b0e0466c…

MALICIOUS

PDF

104.3 KB Created: 2021-08-17 21:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 80d7e4c0fa4e51166a225ec6d8b73c5c SHA-1: 48d0020656881514ae26e1e508bafd8992e657b5 SHA-256: 3122e8e2b0e0466cd53deb9cafac1a78c6d4c6693a74cb30cf9aa7e867027127
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF's structure and numerous links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://laclonghotel.vn/upload/files/finikefedi.pdf In PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/54974895826.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kisijubopezivopoxojif.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rifinav.pdfIn PDF document text
    • http://kotolantopeni.cz/file/11334227997.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102fada87e08---49013239547.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/51362652496.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/xibinupur.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/68398775804.pdfIn PDF document text
    • https://preciseenergygroup.com/media/57093095027.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf78d7850---10404194948.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/wujulugof.pdfIn PDF document text
    • https://latework.cz/soubory/7742581560.pdfIn PDF document text
    • https://webhosting4.net/media/file/25737539963.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/katotalisekenusi.pdfIn PDF document text
    • https://777mto.com/contents//files/31463295001.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1dd152d56818b2b09549789a373ef453/jifovevixuxevanijetegobif.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606da89042429---569982826.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2589bef7632eaaf5d6c72ae634a5a1c4/wajurilowewofedamanenuwu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd71b31dd---kezagurutomuzi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8132ce7599---77065739796.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/94702360882.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/1341516462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=flyff+ranger+guide+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 10576 bytes
SHA-256: fb86202232969a577bb669db11e9d7204f9dbb4a62f881150b3d4faa372c0e72
font_01_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAA 19632 bytes
SHA-256: 63b98db7eb309acc6585704df4e128fd0f2f6a44cbd5225d25c60817e916284b
font_03_sfnt_off00017dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCB 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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