Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4585ce534fff277…

MALICIOUS

PDF

74.7 KB Created: 2021-07-03 01:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad86b0391fd82b8360df9b07e174aaf7 SHA-1: b410e295cd0a69ea5646abb7c8700e9b67cb843d SHA-256: e4585ce534fff277918668c8d5ea3c218255799787b1fa37430481a50247512e
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 CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that use malicious attachments to lure victims. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2af2ab1d970f1a56e364b033d991bdc3/wutuxojubepab.pdf
    • https://asiarsolutions.com/userfiles/file/12742705231.pdf
    • http://www.toptehnik.si/images/mavonurafamagid.pdf
    • http://garderoba.sk/images/_file/makokuvowot.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bef93a50ac3---wexoxidokufabu.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/33127512072.pdf
    • http://jtylek.pl/Upload/file/tisalevaz.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/23a620122c539df2d6343469ee8b962a/gukonivojabilulifipivakem.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad42f301da1---detatajifetodeparavu.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607196c376230---59554560101.pdf
    • http://giadinhlaurenso.org/upload/files/zerakupet.pdf
    • https://rocksoliddesigns.biz/userfiles/file/5613552733.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ce0d3d89bc0fc74294a3e687b2400824/majavedovuzudamozip.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16230679164463.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/fikam.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/74526d23e884dcc01482ffd7b9b576d0/74229057676.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748fdc488b---90587215647.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1afca006a4cb9a735e7ee7fd286b5971/72167262857.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o8ejrqutr585h18jpg4b72g3el/13195128932.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59c814c09---muxadarisexuleje.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/webegoxujofelapuv.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3f5a1fff---kujiredemidag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=excursions+in+modern+mathematics+9th+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
font_01_sfnt_off0000d85b.bin
e4263a6bde2b0cf0934b664e48dd883b079acda937bc3f8a97a12c2369423576
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10944 bytes
font_02_sfnt_off0000f194.bin
d081661bd00405442d3b50c92797153b9c9e9a0ab400aea45e928344b87368a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16988 bytes