Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1937ac111ff3c25…

MALICIOUS

PDF

67.4 KB Created: 2021-09-09 00:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b5c61b0bc985aa55706f13654cd07d9 SHA-1: ea7d57dd8069d0738614c50e0c87e24f5adf36e7 SHA-256: f1937ac111ff3c2587f210254388d76d6d47499972140f6d5a601e72acb59560
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://www.pattyn360.com/upload/forum/files/48541483148.pdf In PDF document text
    • http://chinasoftcore.com/userfiles/file///gutejovafolu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c181d6a50---sabudobisunuseb.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/20022981273.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/26589836691.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/36984795316.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/12759498609.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zazukozubevinemov.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/wamikega.pdfIn PDF document text
    • https://austarpharma.com/upload/files/67155171558.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/diruwuzirawotululimasisi.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/55328693777.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/38142377790.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/63479917014.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/29401656.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161302c8d1894c---ramevapon.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/33452953163.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/16401873001.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/pirukuke.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedec3d629---88650567516.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/67300853216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lightroom+editing+app+downloadPDF 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_off0000ac59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC59 10712 bytes
SHA-256: c3fea0c38b5080d21131370020bcc9a59674165ef2e6984e0a119e41703302c8
font_01_sfnt_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 14320 bytes
SHA-256: 2aa81728a7c88ea6e10af505abc5948ab34eecf00b96817e0349c3b6d82532ac
font_02_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1