Malicious PDF — malware analysis report

Static analysis result for SHA-256 d454a7e51638e204…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 14:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9d81d5c56d9e4fc6eda6e122ce80026 SHA-1: 113a20c838312f7ab29bdcd81d43faad298d0851 SHA-256: d454a7e51638e204ab87a89cc8d88c9aef3bf7b569c1e51a7b0a5cffc6184a81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of link farms suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://knuhpharm.kr/userfiles/file/20210907230437.pdf In PDF document text
    • http://notar-frings.de/userfiles/file/39741147333.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/6971019474.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/leretebi.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/nikewasikeroja.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/rixiwu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jufuxu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/25077365645.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/pilum.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/komavar.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/9811359339.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tejuwufapirekimadede.pdfIn PDF document text
    • http://dd-eng.com/files/files/kuzidu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9194201---52754178063.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/pusosowufagevorafeji.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/35217370294.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210914182623.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nozavoridizanumiwusuji.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/58959824754.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/54004617005.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1ad51e079---sadalezoxetijufizufitevo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b730dec5---510076378.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lipulibopawumedi.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/digofelifob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=use+android+as+bluetooth+microphonePDF 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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 17908 bytes
SHA-256: f52a0df30e6064f9b19e2068f2c7ff59b796a669616e8bba8fdef76e763f2773
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 11024 bytes
SHA-256: 2a7ef35514ce641a317987f63a90e6c7fb01958884feeb190fb78c2691f48578
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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