Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee15754f188e6533…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 10:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ce5d831536785310ccfdd9fe08b1bd8 SHA-1: 5949403dbb1c0a0737232b518ce02699197f7b9f SHA-256: ee15754f188e6533a812c04f0e761a15894ae12ef0c6b80cfe7fe259e7e4dc10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests an attempt to leverage legitimate-looking but compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49e129de8---letebiliba.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a81766cf081eeb5314db83307a92e4a8/93605794189.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/76912637890.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/79217906069.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jefimovutabonorepabal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea867d88b---35876664064.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/22699657481.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/69592955002.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/zakolufar.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/5638457974.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109081338145963.pdfIn PDF document text
    • https://x-software.cz/data/file/18824727798.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/woxuwomilafagelusifexaxaj.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/nimugulujulonuzaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700b473020---61484993480.pdfIn PDF document text
    • https://membermimpi.com/contents/files/tuxevoputupigonil.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/rozodiwejovamepebuteso.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/tisimibewirozoriwi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xufipuwubulo.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/nenakije.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/mazogirupebujot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dragon+ball+strongest+war+play+storePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/livaxibatin.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_off0000ac5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5C 15256 bytes
SHA-256: aaa4e8e31f1bd923ae1f7fbac4584aa3dd03dbf516be33197e73d13ae9d9e8ba
font_01_sfnt_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 10676 bytes
SHA-256: 6aca6ea7888acefc10a483bccde88e5ad5194dd0b05aafd1366263e15295c4fe
font_02_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1