Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fac4872e3d4955…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 07:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63aec81bcffcb708b115c1e0297adbb3 SHA-1: 60e5beb42abc5967762ff0a9623242e72c0cdf88 SHA-256: f7fac4872e3d49558ed7fed7790296c6a0e58a73e3f3238ce2d345b241e91fb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The primary URL, 'https://smidgel.ru/uplcv?utm_term=regression+and+correlation+pdf', suggests a lure related to academic or technical content, likely to entice users to click through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=regression+and+correlation+pdf PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f15ddbd6---77205277419.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060408183273499.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/21492668039.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/96705336134.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/sevuzafex.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/30623457398.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/6154641149.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b7c4ea35bed5571dd6b4461a5b8c4e8a/kejipipekoxuso.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16098df6e7078f---pivamobarinonugu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34575fb0a---vakinotuxiratiru.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f092bb09a26---49661609212.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/75038096329.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/62157312748.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/779e6f2812fae77055db8c3e8011e325/nifebolenavenataxatikapal.pdfIn PDF document text
    • http://sns.hu/_user/file/nofelijor.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26c7d9071e---54040858463.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/v2n2o71imumqj39vfh4h7dn404/bewizinakosuxozade.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/43159941131.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c2faabe3---25716376933.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/8502718658.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/wiromuwefip.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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 19248 bytes
SHA-256: d12d6dc3106712f795fb8c6897e21d88bc9040569f0cc73f6e8844eeb5d526e4
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10840 bytes
SHA-256: 580c06b7e136053b33dfba38ed4841b2d66d7b4bd0ebed4ebae2f45c281e3542

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