Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aaad53b6734b78…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 01:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 278e46daf277d1de98c20b3418caf85f SHA-1: dfaccf68dc13287b12aab748138b8a5289c0a1b9 SHA-256: 93aaad53b6734b788f3e895179ceacd3f8c6e38ddcf4353209c1590011beacbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=cooking+voyage+mod PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/35e7c3b61dc3d19aa0ae50e8daad703d/rogikub.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/ranarusetuga.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lanobuvawofimekop.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671792396.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikaramamuvexirukuxubuw.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/woror.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/joretimitolume.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/84559435100.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/sujixupodefanepojesu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/969e2e5e8f6c7f2d9a20cb1a1720055a/93076969318.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/81270299076.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bde3b30e---57736874470.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/22601700097.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/muremodikexepiwugozibiru.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/59443453596.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/44696074011.pdfIn PDF document text
    • https://derfo.info/resimler/files/82208281383.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/fuzekig.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/81774705418.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/nititufivatuliki.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pixube.pdfIn PDF document text
    • https://promise-land.com/upload/file/patowagebakekoxegobo.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/wobirodenujipamu.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/41615337931.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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 10484 bytes
SHA-256: 2432bcf946bf274ba6e7f7c67715bd303821c9d745efc1ef5d70db75b6257aa9
font_02_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 18688 bytes
SHA-256: ac0d0a384823e58750f43f4c1d82a7849649f1ebc97a8fcc01784670e8c27c6c