Malicious PDF — malware analysis report

Static analysis result for SHA-256 560c8dcb2cf23c33…

MALICIOUS

PDF

95.1 KB Created: 2021-07-18 18:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d45427c3d6fd8648e36bee116dde7480 SHA-1: bbcfe0766da82909fb2b549e3a5c35bcfd10f155 SHA-256: 560c8dcb2cf23c334726df070d9b2f05568b55138606a7561b1b76c60e56ba7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://poltinik.ru/userfiles/file/22570930459.pdf In PDF document text
    • https://idd.no/ckfinder/userfiles/files/gidol.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/regadenowokolesif.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d72d7a59---55682526679.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zorakisorawuvawotekopi.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/vegoramegefokomo.pdfIn PDF document text
    • http://iphysiology.ru/upload/87322453546.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/xosonewusaboxojulax.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69c7a7ab8---49885054951.pdfIn PDF document text
    • https://85097781.com/upload/files/57951118367.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f8b5957de43d04f89d00674c2cd122b/63166006985.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/76ee1k65mihusm88h5tb9n5m55/mesinika.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/fuzokefotena.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/49962921326.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3eb81bea---1376543116.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/piwilawimug.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/va6k41nsahfo1p5j5avf8ukbb7/33266794612.pdfIn PDF document text
    • https://motacademy.it/file/gegixakigixaj.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a822149ea4---samiralubage.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/54220908997.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b61f2216---75324333527.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/97910641980.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a7e2a6856f614ee27403d91555f5d27a/divodufutakonebelase.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18369e4bd---mejajexodejikugogolenukit.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/sekakumexudu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b108408b3a0c32676c4d95e7cf986aa5/94105102133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+take+off+the+magnetic+thing+on+clothesPDF 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_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 10852 bytes
SHA-256: 6414845d9883f24cc261aced59b7c6cbf7169e62add23d47906e65923474190b
font_01_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 17056 bytes
SHA-256: cdee21c4d882031cf28b12c0ef7c5b998025471136464d009b58c6687a6c2978
font_02_sfnt_off000156f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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