Malicious PDF — malware analysis report

Static analysis result for SHA-256 616dcff6f4452ed2…

MALICIOUS

PDF

96.2 KB Created: 2021-09-04 09:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76edb29e86798eda62fd36e575a10c94 SHA-1: 7e77d246fe51c981d44fdb02df550ed886aad644 SHA-256: 616dcff6f4452ed255058f24af09120f2481ad5c9a14572a41bac9ff73134530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=minyak+inti+kelapa+sawit+pdf PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee6ebe7b136565a47ee33875f3e79350/sifidinumiz.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/74710710840.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607887150718d---ribefojasuzanofukeges.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e0976bf---63714592790.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ee796ec134d7537698200e4fbc826875/18671736366.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/72526895843.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/63629600378.pdfIn PDF document text
    • https://noddy.nu/images/file/95262776734.pdfIn PDF document text
    • https://foulardfotografando.it/file/40989243315.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8b9435cb23275585febc5c27b3a616cb/9526063029.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072923e65f25---3354088328.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/vugamovuzezovulufi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9759f45a4ce55a7e06b14a6e49ded16b/71854620769.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210830_231154.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jigebesu.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/wadirifovesokovukima.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/3465950500.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/89669141634.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rinetejoxu.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/80094098794.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4474dcb3326c390507d0127d34ec2994/32551258478.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8c8cc8ba4a6d2679078d49181c707647/xejafejerisivawu.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/dokoluf.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/lelejofuzumozinarogul.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721e467d234---62067105741.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_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 10556 bytes
SHA-256: 0dcd361e88faa054b244758c03e2fbe15ad0754c53e1b4d7423c700f06ecbf7c
font_02_sfnt_off00014532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14532 17372 bytes
SHA-256: a8c3083ffee95ce4814592751cbf7cc8a8a342650969ad3073fd68fddf9b3fff