Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c58a19d56276efd…

MALICIOUS

PDF

99.7 KB Created: 2021-09-06 14:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67457613b06ee2f04c27ef7be6026857 SHA-1: 887ea44e7127ac37d276769f55a386452bb26435 SHA-256: 7c58a19d56276efd2b6fcd78ec436bd272153f9bf651de56709376623250c066
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://irlanc.ru/uplcv?utm_term=lei+8080%2F90+e+8142%2F90+pdf PDF link annotation
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/21ontr1s3i1f08so7l0ot88dro/fekekez.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/61360785957.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/mpntmb57ke5oo7gtdjkdqrfd53/jurutedimorogalatepuvo.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/pusonisulowek.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jd1t97u70p8vvhekr22nmujepb/wuwug.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/65575150374.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/69630852512.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee83d902a7---19879496854.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/nikekovoteburunuzuzokizal.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/54230157342.pdfIn PDF document text
    • http://drironcat.com/images/file/28859363067.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b31dc533ab8c27de618a7013021ec4ea/finewukemebejomagavika.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7efafe4a---tawizovawusax.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/fibujawonogiwovabatesupi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e930c3560b31ab64198697f4a8e3d10e/34782493186.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ligumafuwilasamavog.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/k3p564ibb8baffln02mse7hqu7/98276658465.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/kanarumafinikavazofavozo.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108231718337301.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/lusorogasebuwoto.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/piduxevawurepitebofu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a32bb187---jotimajunugovudefu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8517ea2a---fabaxawoba.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/dufebenevawewu.pdfIn PDF document text
    • http://hasyo.net/files/file/53230022953.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/84810163621.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/63589499099.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_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10432 bytes
SHA-256: cf6479a64c7a2cd8a7fa7014b6ca1f26b956645d1061afabb2c9ebcacaf5081f
font_01_sfnt_off00013825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13825 18736 bytes
SHA-256: 60d36699627ed74fc74c7466d0d156356b07f7e7aab9a438014b1e1bcd60fff6
font_02_sfnt_off00016917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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