Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eeb7e818bd121e…

MALICIOUS

PDF

82.0 KB Created: 2021-08-30 06:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dd6a83cf1c9ffee12e93e33456fcbe65 SHA-1: 0857040e4b3f3242bfe4e50dea222e0af647d7de SHA-256: 21eeb7e818bd121ec454ca8c653f202fa2f1f251a18424db4668d9ebd083b3ed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is designed to redirect users to malicious content. The file's structure and numerous links point towards a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=puzzle+page+picture+cross+color+issue+1 PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/440286d0af8ae814e13b70bdbd09a55b/tolotuwetujazonejujep.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070096a1f85b---2842706833.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/32654260062.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vimol.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/titibenuxavanasut.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/nalujuxixaxusikodu.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/dedaxigagunonibirije.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/73111306208.pdfIn PDF document text
    • http://asustainable.com/global/file/20917257969.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3544ba2b9---pusosiketezotev.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a0760132790ecd956cbc5d0f3898928/86072774368.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/nolog.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/rufubedafeduxujaz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160875489ab891---tikowipavomajopisut.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075193e0d31f---63888115455.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/95046427092.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/ribuvufuju.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/xuborodolifix.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fb820479f1914cc91e9dd02b9fc8776b/29374400265.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801bcf9593a---4635390460.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa4bc6ec8---zofasakazojetejezakakis.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/luvoro.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/26130070472.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 18200 bytes
SHA-256: 73e229bcc580a0e6f3aade33b7953b3933cd793f41f1c951dcd9aedb33ba7b20
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10656 bytes
SHA-256: 6254c7b1cc5bc096c0a5ae1d6e0a87306798084e3ec7e180b32bde679b15832b
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.