Malicious PDF — malware analysis report

Static analysis result for SHA-256 df741c2917d7a728…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 04:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30f16c15430ffd5583801e04263c62a5 SHA-1: 8628320915d515d1896a7ceb1b12486abcd4ca42 SHA-256: df741c2917d7a72896cdd183290c410bc6ba299855ef6e9b09c5b1c60c1db4b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=printable+math+worksheets+kindergarten+addition PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a0855fe0---21714310883.pdfIn PDF document text
    • https://grancom.by/upload/docs/nivajexojirebirulovedeguf.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bba73164072---29925609262.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b6a70a2a9b5f55e2bbaeda1c1c4fa0b3/gosawe.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/750cc8e9bfa1705311dd207b2da3d598/getifojuwunenisipe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa69fb6478---fepexexasubatodi.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/23754746576.pdfIn PDF document text
    • https://senhewood.com/d/files/65322161814.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/30178155540.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/vazogo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9c997533---5589753841.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/23870541634.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb3eab1d7298898398543705bad3eddd/pizofan.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/45393528584.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/tajavuj.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/88363295057.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d1e7ebfa088d7c7f3cbf4ae8de15245d/zugesiromatejanosipofa.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kedupugaxopude.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160861e3865b58---luzetadexejizivon.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/44087511894.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af36b0a406b---xagokilugemawow.pdfIn PDF document text
    • http://maidichike.com/upload/files/lefevenetul.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/zisis.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/58102408503.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609772a0774c7---xutisupusodebek.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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 17620 bytes
SHA-256: ecb8698696ca34a1fcc91cb551e8e80a66ec20fe671b68cb3e2b9c67b2ac5286
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 11012 bytes
SHA-256: fefd250b2c6d7be4ce3f662774d556874bceb16757432fbcc3754f3c6a850395

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