Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5000a88d9c1bdf…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 01:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84f2aae465bc93850fd693b8e231eafb SHA-1: 4817ad1b70d9e5366ee6d6b721d4d045e16e98a0 SHA-256: 5d5000a88d9c1bdf22c0292c1fbe8db6dd770cee36aca1f38cb70745dbadd86d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=my+jio+latest+apk PDF link annotation
    • http://distant-property.ru/fck_editor_files/files/xipakekaba.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/30394492193.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/16126951351.pdfIn PDF document text
    • http://space-edge.com/upload/files/fodisiw.pdfIn PDF document text
    • http://platcometals.com/images/file/rapixotipazamowotebezotu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/25535640442.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/68286004318.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/70234925967.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/22416170514.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109271704019116.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/49463751576.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jadujokabiliguwitor.pdfIn PDF document text
    • http://marlin-aquarium.ru/ckfinder/userfiles/files/zamirokipelufanogovulo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151e9e280360---madapatetazafixitubib.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614363a59f97e---jatosawikurawurodiwebu.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109161549492383.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/83676040401.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zirutekosedapunagufedew.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614baec9c232d---ritotinajit.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afebae1f18---pijuvaneri.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dageromavo.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/48342953019.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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 17612 bytes
SHA-256: 3c7b5b14b27bc4d5eed5c2f4592fe2671baa196d2096fd691149a3da3787c1ea
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 10372 bytes
SHA-256: 34c9fb29aed12bc72312a2a4790c6931aca24295d6124fb5d1c06365968ae2e2
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1