Malicious PDF — malware analysis report

Static analysis result for SHA-256 e880eb952f20c43b…

MALICIOUS

PDF

94.1 KB Created: 2021-09-03 02:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a3023e3add5f8da5ac6c1aa5f5fec2e SHA-1: c5669691866fe4f43ec7214f96e9b8ded0a38f9b SHA-256: e880eb952f20c43bcdd5a014ac9729486d8027e680aefc389084a264e9358d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://businesslife.com/content/files/57344111864.pdf In PDF document text
    • http://mu-rrrc.com/userfiles/file/82546720225.pdfIn PDF document text
    • http://odumakus.com/uploads/files/71096933799.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb0cafe15---dufopiduvaremibowuwi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/zejijogufalolotomujo.pdfIn PDF document text
    • http://tfforming.ru/d/files/40651123402.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/33589723729.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/giwuruxepajejurarulozaben.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/velenutimanuva.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9680ae962f---tovoxokuwikojadexafobobok.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lqac8qh711o39sq0bsapfhohrs/6799890264.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/7715287541.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ead44d70---xezupofurumox.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/504183ba31560c4ca5445af597ba1ab3/gugebabadodasulexaponamun.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagefalaxovugedaxakura.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/guvivakikizanalutelezo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72772becd2---fexisenuvikutiji.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92020767698.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/jinabikurijapetikaseketa.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d973d19b360---50815146939.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/53996912389.pdfIn PDF document text
    • http://akademibt.com/resimler/files/65799512241.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/mogokozofaregobib.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/79822143427.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16116c94e5504e---bufus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=esl+worksheets+modal+verbsPDF 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_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 18500 bytes
SHA-256: 5b2f3d2ae39c4dea5ea4a12450962325d4aaed09965eecb0429cdf592151626c
font_01_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 10684 bytes
SHA-256: cde485cd6ce579c96a549c6251676cf85c0befb451a84e949666e3611794f34b
font_02_sfnt_off00015250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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