Malicious PDF — malware analysis report

Static analysis result for SHA-256 d604af9b58ad9150…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 07:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 467b51f082c7b6dc245f9a79a4422104 SHA-1: e36ef89bd4730a093a0ac8b3019d3a317565efcc SHA-256: d604af9b58ad9150aa6040e48dc685e7c701424cf1fafc2e1435648b3b37c8f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm on disposable hosting and links pointing to compromised CMS uploads, suggesting a phishing or malware distribution lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=low+end+android+emulator PDF link annotation
    • https://portalbime.com/UploadedFiles/New/file/rosofeluxexoralipe.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/56710440648.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dofifamofu.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/70342857342.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/40366121180.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/falosupusukuveguzege.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/91148326664.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/wukawimuzag.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-15/20210915172309180107.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wezigarimutesata.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631042036.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/9674399373.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1169952233613dad9eb3fce.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/fumepuzudozox.pdfIn PDF document text
    • https://netpage.info/userfiles/file/34624848262.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/71968852717.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321aeff2e39---toregifas.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9dc14bf3---79381467242.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/defuxuri.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/cc318cdc55746f797e7a0f004c0c6200/nexavibipofes.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea99798c3---30277484960.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/510548232.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/bexuvatexivabi.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/22584928654.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/24675982055.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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 16748 bytes
SHA-256: 890e7c41f5f827e80b09a077de06df5f50ccccb9f002a33c1c06dd13197d128b
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 10384 bytes
SHA-256: 08ba0672d58c78de27cc2437c6ed56515d5de553b780dcd839a9cd49f2769c0c

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