Malicious PDF — malware analysis report

Static analysis result for SHA-256 75497e95e20b37d0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 18:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e2fff677e9e5d320a0f06c979096486 SHA-1: 4b3ecf3e7eac15a2b337ae26f65c59091ae06bd7 SHA-256: 75497e95e20b37d0ccb6c15c07d7e9f47ccbe2edefc0ddfc7dd56ddddfc9df98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=how+is+a+solar+eclipse+made PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62323c5ca2.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/191fe99caf739fe2ee4f6fa372b98c7b/mevova.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/35150998704.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/333ff1923a2a3cd9ebb31c9b0270db8f/xizakajukogu.pdfIn PDF document text
    • http://slsnn.ru/content/file/54072417530.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/93315708887.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/lerizuzadajakufito.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/fufek.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/davalixotalobipufeseti.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/dutodadizuvazotevepituko.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/804ecf26b596524cf9000bf13cba987a/badibadata.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f5hcv029kojtoulbfc9vmcth40/3344349143.pdfIn PDF document text
    • http://artospace.com/pics/file/51882077249.pdfIn PDF document text
    • http://wohingltd.com/userfiles/99546067000.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7022e87a4a1cfe03fbe38b65ddb0304f/17599856906.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078403cce64a---siwojuronidelajipizulalif.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210713160746858.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/totigopi.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/kadopefor.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5ef9efd2---81504829633.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wudenipakuxod.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/65128005340.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160df5f1aa6a8d---garogoxulimisupilirimifal.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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 17608 bytes
SHA-256: 7289021e446e52e5884ad949d0fb0c73400bd2b66c0dfa6e098724fd807f7284
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 10548 bytes
SHA-256: 215c875dc24441385ad458442015b4c5f70235b3f729ebac5467dcc0d62c2675
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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