Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d334ab37c2a43b2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 09:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fab0162be17bf0ecabb18d5d917332e SHA-1: 77ece28c0e014f661188e30460cae1d3a2246ccf SHA-256: 3d334ab37c2a43b2af61af735e751f2f842acbe80eb5a4851334349bb56212b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and a link farm on disposable hosting further supports this assessment, likely serving as a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://simondaulte.com/ckfinder/userfiles/files/32409035544.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f9c6e767---fetegija.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/9746298146.pdfIn PDF document text
    • https://highrise.pl/file/10518618505.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xojetoxavenazizuxuguda.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0ee39cca---22554294288.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/lifeginimed.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/44132643893.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/lolisibigukiwem.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/xejixakatarixuf.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/nuzavuxonolefopoxijara.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/6005164145.pdfIn PDF document text
    • https://terracell.info/images/file/83018577540.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lqr14usv6qhkoc54mkrp5dqc3o/31513236780.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/xamilusejanekezojapirujat.pdfIn PDF document text
    • http://373113.linker.tw/files/94061758112.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/26987775039.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/78610290598.pdfIn PDF document text
    • http://sbairs.com/datas/files/28195877374.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/63866885305.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/tigowexewibakaxovozig.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365fa48501---75059290688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manhwa18+app+apkPDF 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_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 18932 bytes
SHA-256: f6e494ecbd013ab3f20601696d2085d53282faba1ef06890a27f070ac4502b6e
font_01_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 10024 bytes
SHA-256: 39024e68270d02fb8b6dc97a9f80f0b03e1960c6246059d3150ce5aa69be740c