Malicious PDF — malware analysis report

Static analysis result for SHA-256 595be9000a913000…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 19:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b7029843431c91d8913049fcaead169 SHA-1: 45c512c1fa3be3f31f283c6b82ab822baf6e2cd8 SHA-256: 595be9000a913000c88751b616cf3a911e827b869b5ea5a5aa79bcdf259e1df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and link farms, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=deadly+pickup+watch PDF link annotation
    • https://pasarangroup1.com/contents/files/dexenamepebenupazaf.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02aa894a8---xaduzojozobuvojamepeta.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910231304.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/39114215190.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/gapuda.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/mejibodotenonazoxilex.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///26394745894.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xajilozat.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/xiwanunemijudelaxele.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/14235524293.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/31741820141.pdfIn PDF document text
    • https://ip-pharma.net/data/files/73954542670.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/45021887495.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2l0dm1kc640u1q8hhbl8m70e5g/57669700250.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/bejavubujifefewifasajigud.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/38939586661.pdfIn PDF document text
    • http://xhzhengli.com/upload/36382151183.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/gumomufisuz.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/bapamalezem.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/juribajipo.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/80859951990.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138917cc6f81---jikanadupiki.pdfIn PDF document text
    • https://eurotig.ro/file/laxidapijisenusake.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/luzufalikujaj.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_off0000b51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 16368 bytes
SHA-256: c8a8bee3b46919cfc02dd78c60443fa65066715e310b5de960bfc985c1081446
font_01_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10512 bytes
SHA-256: 53a5f61abe43e8d32d97023ce829f5e6e6a43984fefafc6a37ff6b516350d5d8
font_02_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1