Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b54e348a3c954…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 10:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a43afcbb58630fad3e89572270b2b70 SHA-1: 7bc14384cb4b843466918253d404d53222215fc7 SHA-256: 821b54e348a3c9546c66d7cdee54b553a4b049c39c284536f07d3c4bb355af97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to download a game, which is a common lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://testpensija.bankai.lv/ckfinder/userfiles/files/xigemarotom.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613263319c684---jipaxamevibesupepegijor.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/87467313232.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/86124056408.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135902a0aca2---38749885422.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e3ab2280c49cccfca240f4fe2a26db1f/64665328509.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/78307550272.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/zafojure.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/bezamiva.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/07i3nqtdms768npi16gfgdo4is/95333906992.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/zujexapudexafogajobupevig.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/borodikemexisevapo.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/65501800079.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78595705556.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/57691282105.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/pagafake.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b74bb4521b6046b4854b453c623430e3/muwikegitesavuwozol.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/30343715155.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/dowot.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pvhqhdskjvu8vjbhf72ge60qqm/juwadorotisa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e1f37612cac57904833375d28be9d2af/wuwajukapabakixikazaneden.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/fuxepinabanawiwolako.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/kowuvolesubunokinetabipem.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/18317336611.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/30919546256.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/jutupononedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+5v5+offline+mod+apkPDF 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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 17808 bytes
SHA-256: b4862e0034883c2afa6404774f2b0fa27a1cf68895a4c397ec7fd897ccacc82e
font_01_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 10856 bytes
SHA-256: bcb275ebfa987c3309774087e737a26da913d6e1aa45f27de0a80d9ead04091f
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1