Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7821e9a6051c2f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 16:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5f765c56d8804a55200f9dd387af933 SHA-1: 41c669e7066bfbc4c8fa3e1e176815ab72f80700 SHA-256: ae7821e9a6051c2f373d17b8f8f80823d4c1ff22cd9f04903e3051cc7c1629af
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, forming a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway scanning. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://votava2.altrodesign.eu/ckfinder/userfiles/files/rivifobasexabekafozasal.pdf In PDF document text
    • http://cottoneauto.it/userfiles/files/74400940833.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/tawinefukonapedosovafe.pdfPDF link annotation
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cicjnsdr95hnamg20lbp2rn0ho/deduzolaka.pdfIn PDF document text
    • http://hidropro.hu/upload/24774229315.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///82850054840.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuxolelasuvot.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/71541850200.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/74372966602.pdfIn PDF document text
    • http://chinalabware.net/d/files/7482424162.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sidagimorixur.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/92917765494.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/lomutet.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/rigunowubidulewodobula.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/pofuwotiluwomakalinisuwup.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/tajupamokika.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131099cbc5df---vabakaxawilowojob.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/9555622256.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ef41812d---53735429784.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/vekalefoxasemixoromof.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210912093447.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a45d2321f2---dukisemibefefuworuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+recover+deleted+call+log+android+without+rootPDF 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_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 17848 bytes
SHA-256: ce29ea70782463bbac99c6b54aa35415a83edc7e6555f6e2c446c813fe0cd256
font_02_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 10724 bytes
SHA-256: bfd631d622fad44dfc7a0610174c86259d2b1edaae21c8eea592f60a32f50c86