Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5e13b29795f588…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 12:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87e4a98768efd9105788dc8a6dfde88e SHA-1: 2f9cba425ccb34b6d36c452c007fb4a46b081e46 SHA-256: 7c5e13b29795f588b09297de42d058552e12a5b648878686d6491784cf7c93b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=add+and+subtract+unlike+fractions+worksheet+grade+7 PDF link annotation
    • https://brawlcall.com/ckfinder/userfiles/files/35111194501.pdfIn PDF document text
    • https://rinducm1.com/contents//files/betekavifimabomega.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/21378573985.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rvu8s3vbafpbtumep45m9lkmcp/wimiguxutukew.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/22669091744.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/lowatokobumejafab.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/soxeferepoleti.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/619b3c8b806ff1faa691398df30cda4b/73222607717.pdfIn PDF document text
    • http://electric-kernbichler.at/57681980859.pdfIn PDF document text
    • https://777mto.org/contents//files/popadazajosipegosu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0623201d9---gogijaxesinajon.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aad25eb64---39552933824.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dffeb3741---vetigifidetuduzonu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bbfe9cef63ed3f1202c82ee135851773/wibezadukela.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7598b80c43---80773218430.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44eacdee58---49796710084.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/nivuxoketisudofowukataja.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074804f81da3---gijewigofu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d20f93117d951cfa5955b2949718f27d/34667219061.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f38422413---getozojuxorevuzumiweseji.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_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 14976 bytes
SHA-256: 1797e1577eed38aa00fb9d8d4ac873fe3d3d029ea07af442bc9d763f59d5eff9
font_02_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 11204 bytes
SHA-256: 6906989d64448db188c1bb336e7dac3116b35b18773d17864c50b931d8ef1a9f

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