Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45c05177440b5be…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 02:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5d164c77293ce6ec688eeb669ed90c1 SHA-1: 9ce5629eba84d8947e165df07a6fb7e99b75c140 SHA-256: f45c05177440b5bef77b4900b626519731a4902a2d50b1cc83b889c5ae46ccf2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external resources, with some hosted on compromised CMS upload storage. The primary purpose appears to be directing users to other potentially malicious PDF files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://udelimpa.es/ckfinder/userfiles/files/95526861583.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f21190313---93885312667.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/bubuwajafupulefemit.pdfIn PDF document text
    • http://aurora-c.jp/files/files/bumilomotamol.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/60168373829.pdfIn PDF document text
    • https://anaksemut.com/contents/files/89309046476.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/93681540894.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/telumulapifuxe.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3005d2da---lulatabupanuvativowosule.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/43551074811.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/tiwugejubabefimejeguletek.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/muvodumabafatefus.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/mizupimobovizanuvamowow.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934be5c60b---67432082751.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk8shkdtfpi1fh77bgittc0vpf/lokelavaxurot.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/69198143037.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/88431676592.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4aafdd00f75139259a29e4b3fa9c2eb2/laburopixutowukoluni.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/buzumuwuvolatesomurotoxon.pdfIn PDF document text
    • https://austarpharma.com/upload/files/sidanu.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/20071330304.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/wobegikesa.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/96086422020.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nigixodokobaruretuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wizards+of+waverly+place+season+1+full+episodesPDF 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_off0000bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 10984 bytes
SHA-256: 95e5451bbb5a2dfae665af174672da16598fb027eabf507f3b99801b90452d13
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 17320 bytes
SHA-256: a772bbbd0ea9bd568fae642a2ee0751688dcedbc7bd5b92b5fea4a229cbd8063