Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce930cac3510f03d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 09:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e278acb5eda3b8a6516fdd1ecdd491d SHA-1: c39eb633698dfa6983a8244e52434709aba0516c SHA-256: ce930cac3510f03db4a56b26499a2b5e3c1c51cb12a7ff9b62032808cda37e24
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 WordPress sites or disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://gernano.eu/gfx/userfiles/files/70329133438.pdf In PDF document text
    • http://uk-finansist.ru/userfiles/file/buwonixibupixofom.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/74243146719.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/vabujikurosig.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/db2a00984f5a56c92431ce07591205fd/62721712448.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf04d147a4a---72736763470.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca136a3dc4---xamemiwanojalemaf.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/41613783808.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/goxaveramutimaru.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114584a56a1f---56181299697.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d33d04b6---34159402523.pdfIn PDF document text
    • http://unsersohn.ch/images/file/mawupifa.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/sivof.pdfIn PDF document text
    • https://medtek.vn/storage/file/kudigobibizisiwuporoweme.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072605062473499.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///5913370253.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/panakofizagaluropowabi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c726dc5f375---taxetetatodekirus.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14be350cb---fafawavagita.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/20b3gb5ala88a0tldnm18nt0k4/78839627897.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161844334553.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/44412789525.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/42499926753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=significance+of+international+relations+pdfPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10868 bytes
SHA-256: 4eb484c7b08e658673551b7e8984e7b6a65f9316cb2c23474e5ba4732314d454
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 17440 bytes
SHA-256: be8c070a82fb0c055bafbcfbdb58ce5808f47e4a67d41c6900643d069eb0735c

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