Malicious PDF — malware analysis report

Static analysis result for SHA-256 243ee578cbd5aa9a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 12:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2afeee3eea68c224de05c85561308eff SHA-1: 9de4de06f3df30140304d62598cf32fd76960ddb SHA-256: 243ee578cbd5aa9a886eb541cc78e03001848be99622580cf73a96cdf026acc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fablab808.com/nbloom/fckuploads/file/35050250893.pdf In PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/tunefalenetewolu.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c8df483e122715b51d8cc4b6d7e98ade/gapezefa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc02182d9---18886222880.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/gunejefekoxitozujufefuje.pdfIn PDF document text
    • http://scarpatti.com/files/45681643327.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613417dc7b0a6---datemupurudanizuvimip.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/lekozekagiromoxilal.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/nosar.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/46115612728.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/ruganebepilomavuwomewetig.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/jidiramizojoxevejiziwet.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae336af019be58ebaeae4de6d0034a95/13114923488.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/vesusodatewedasutapa.pdfIn PDF document text
    • http://chinalabware.es/d/files/86899912332.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/bezugorebaputavimefujuboj.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/pijajodigawutoxafiralom.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/nigukajalejobizigu.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/3845352700.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/kuninef.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/5389340781.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/kudire.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88357786339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=historia+de+la+pizza+pdfPDF 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_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10436 bytes
SHA-256: ba2bacc687b1f6f7a3e9d8caf18b6ee47817628c8c76d54c88f0802508ce5d6b
font_02_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 18080 bytes
SHA-256: 465996dbb4d0335f1a02e3933ce0ed5c2b0e05b99eee1756275711f0e700627a