Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16ca0400c101e9c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 01:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a07afb59c157390cfb4495e7bae8005 SHA-1: 1e39be57540ef646ae73d9e03ee3764f0e99e3c1 SHA-256: f16ca0400c101e9c6fce8dd24efa55912986962544da5cf53167a259c92d62d3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious sites or directly host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e75e7d7e6---13115971582.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bf27252ae1c4ddfa122a0621de4d3ad0/tugemilowonifemokevum.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/g5lqvpsdlgbmukr0g04943urp1/lubur.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/tewifasojuderisiritizu.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108161736194102.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/guzadutuviduwomivo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102ea0ac86d9---dagujajetotadosun.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/de9e0b80a6f7a10746f36375aa86b556/vibiperavatemovaruro.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748f590dbdc---54373709179.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/lakamiwowovizuf.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e899267---rupufigivisanosaromoz.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/75977646104.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/sezikezudorogixo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161187ca472382---doxorejuwivuf.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/83127463634.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/58515486693.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/71086577854.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/4368178656.pdfIn PDF document text
    • http://getem.eu/files/file/64533872582.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/25548477721.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c167d0a504---23479375087.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wugajuzuminak.pdfIn PDF document text
    • https://phr4u.com/files/30127508143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=commented+meaning+in+tamilPDF 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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10352 bytes
SHA-256: 0bdcdd5dc97fb0b35cab043719faf553cfa1e942f907516b53b05dafc90ecb1e
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 24080 bytes
SHA-256: 899d9713b0da1b50d07d908f4729745ea09d95dec341e5b0327c264a61544819

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