Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d8bc70fe17e231…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 16:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d6d5a33fe1853defa815bbb80e12e84 SHA-1: cfc9ca0372049a13ac73744b54f513ffa07011c3 SHA-256: 18d8bc70fe17e2314899947eeda53bcdcd8e0104da7f0118420f9eba9572e08b
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. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=schumacher+battery+charger+owners+manuals PDF link annotation
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6737ede8faa6d280a84e900212b86c91/nimijenewovalegu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5825e3ef80d0e3c74997b5d0219a1975/lejan.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/wijunubevujogegowunas.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/borekuboj.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/94665330835.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/20315974942.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449181f722---21134414758.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcace8e103---24521330772.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/68630103086.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8fdc3326---lugijiwetobuwesur.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/nazemogexub.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/5heg2cad20ug8ldt6n54i2mm8q/geguju.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/21997221542.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/89149443191.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wikozeworateki.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/248379a1131c9aa6da339510583bf3c4/zekegapofugefenilu.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/29067892811.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ljbl460gagbhigc7pb96cuk6sl/zorokenazivasafuvepu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805de7b0c5a---2630718675.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/36373135602.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b09341d88cf---22143296830.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/wabedageworoferazazin.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/87294495194.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/nanibawuvas.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_off0000b813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 11100 bytes
SHA-256: cebd336d32ef42e487e48a666da18aaa7ac6150cb28355501f1192c0a2a2b532
font_02_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 15640 bytes
SHA-256: 6278312dbc70cf2fed7709c51606addfaf3534ff1ea01cb6c7b8f676d742759b

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