Malicious PDF — malware analysis report

Static analysis result for SHA-256 64df91253705c654…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 06:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 755a661f213a94ae8250bc1b9f749b34 SHA-1: 0dd9b8edc8794cecf32ad3c36e0901162b25becc SHA-256: 64df91253705c6542814bd2562294db5139e8c8b941da34b2bd548f643918b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern appears to be leveraging these links for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sukienmiennam.com/userupload/files/bajuwavinikamerurinekeje.pdf In PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/navadifiraj.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/dodarotusumususutuvu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69680a2fb---19680876801.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/tiwovofibetojid.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea3ca79786---54139454559.pdfIn PDF document text
    • http://pb-book.com/user_file/file/povexifepapifowi.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/nekalofusajowixifexelu.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/rituxami.pdfIn PDF document text
    • http://ausafe.net/images/art/files/xikupiweturomogo.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/71521017845.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/nazuwof.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zedaliwuwuzifu.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3712fa6a915cdbf0f71bab9cca8509f3/fapamowerowumudimopokix.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/49801180995.pdfIn PDF document text
    • http://someteme.com/archivos/_20210704094508.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fc0ee22cb31fcd84c600b278508f6908/pavefizirapixeti.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/gisagipowibazodarilibixe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a7b7b00250906443a1bbf9e21fa9069c/rabitomonilegonipu.pdfIn PDF document text
    • https://coatielectronica.com/files/zunux.pdfIn PDF document text
    • http://lulanjina.net/upload/files/71665499941.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e16fcc05f---jifuzite.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210621_E89A65722CFD223A.pdfIn PDF document text
    • http://esistore.com/userfiles/file/nuvopafamivaxin.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a1624c889---88651242441.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dolis.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/vibevusizuguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=comparing+mitosis+and+meiosis+coloring+worksheetPDF 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_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 11172 bytes
SHA-256: 657bd7f7e8ee5f2857777324b1b8215388b16a67ec8b40f8d6f6f4fe6ead73bd
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 16492 bytes
SHA-256: 9e986b743835650f7b343938bd9251785234b825921616c429f1e9dc1b084403

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