Malicious PDF — malware analysis report

Static analysis result for SHA-256 4246cf55eb4992b8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 12:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99e488a541a406504f7f37e778132e96 SHA-1: bfb2682f7649446cd9d72b9b658e7455c8a63476 SHA-256: 4246cf55eb4992b8be5578a0abd999545c8b82e7654f2aca0a6c5491893d3f06
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the structure and URL analysis suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://grupposcorcia.it/userfiles/files/38913526273.pdf In PDF document text
    • http://salonorganica.ru/upload/files/wured.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/temezifelakirarok.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/53149574384.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/vetawogabofazova.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8ca0a6217c30e5caa42190d3c304eb02/jagatevujixifug.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a666dcb669---wolufidipurofoze.pdfIn PDF document text
    • https://fong-cai.com/upload/files/kuzodezipowugosawamat.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/joteb.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c61dda83---92090520420.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/64839832470.pdfIn PDF document text
    • http://ellev.fr/upload/files/20938834917.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/34514502006.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/notaganudi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/12485516911.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/51038895769.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/wirujobedarobifiziveg.pdfIn PDF document text
    • http://kite-surf.sk/files/40870081367.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138174341311---forabafitunodutedami.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ad9668cb---lejepidefupivajoxaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=funtouch+os+phonesPDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10148 bytes
SHA-256: 53a867964be1696595030f35fb36ff65efab8b01357ae5d957af6fa1dddd690a
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 18416 bytes
SHA-256: 5729a8824c286f6d0e2d680aefc0da4399fa0403d5ccb943b210407a0915225d