Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b45fd9115643201…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 07:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cfffa4f560c2bba4d8dd7322c8447be SHA-1: 612e6592015f55bedf1ac5d5f155259de13a5987 SHA-256: 6b45fd9115643201d1ce56af70d759118407f2e8e786c98c8200e04eac5ce955
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL findings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4e7cfbc56f070cca6c87ae62e99a8d50/mepoviko.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614412238a320---rotekefod.pdf
    • http://ahkkpcm.org/userfiles/79778321560.pdf
    • http://thebillionbottom.com/business_school/uploads/file/vomepeberukidu.pdf
    • http://fencefactoryny.com/userfiles/file/puwuzobaz.pdf
    • https://semangkabiji.com/contents/files/57751237964.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1632014727.pdf
    • http://bacvietexpress.com/upload/userfiles/files/77735533389.pdf
    • http://ocean-ex.com/images/blog/file/sobuto.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tmr6davds1ii00mg2h3fpfvj4i/20671879443.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5511be5e0---35470929494.pdf
    • http://partner-support.net/user_data/userfiles/files/jodozilov.pdf
    • http://detskypohar.cz/upload/file/76247328476.pdf
    • https://spacio.hk/attachment/file/folipulusex.pdf
    • http://wenyanchem.com/upload/files/nekolisedagusanopole.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/31596898674.pdf
    • https://nulifeus.com/~nulife/userfiles/file/18450953127.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/xazudageroxisun.pdf
    • http://af.ssla.ru/images/fornews/files/60801549752.pdf
    • http://bebsulmare.com/userfiles/files/wururawetakolozeg.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404f37f2034---43043057569.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b2de9be5---kejalodifeku.pdf
    • http://artepcb.com/upload/files/4471825953.pdf
    • http://wsm.hk/images/files/wuwurojolowabisukoxasa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+reels+do+instagram
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e146.bin
6604885eb5895b02d69d1ab36b760574a538eee7110ea6c6812f4bbf6eebb9ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 16860 bytes
font_01_sfnt_off00010c6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
font_02_sfnt_off00012481.bin
197d664304d29e89da23b9c587f05563ef111f010b30bc2035733ebc60455a79
pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 10680 bytes