Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9f949458c2d3bf…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 01:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c18d6d4608c447d6f8a4259a8ab278e SHA-1: 2a95605939f34c79ee919cce4d2043ed1ae11e4a SHA-256: fc9f949458c2d3bf2a163cb1f8bd134ee29746ada71ec39b5d59bcb231ce4814
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable actions. It contains numerous links to external domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=dragon+city+mod+game PDF link annotation
    • http://mediedil.eu/userfiles/files/41068662539.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/vaxorirejojefukegomeninar.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/92268577009.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/37462770169.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/menofugunile.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/88468674827.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/37560470329.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/51054161858.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wataseruku.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/xamepapunoxer.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhbf1t6vb6lp6rh5j0l1njt3bi/ruvejonoza.pdfIn PDF document text
    • http://nineslash.com/user_file/file/nenexalefiwaxe.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/67337912762.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/safasumo.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/26065127986.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/230759770.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/busipifidi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457707eb1a8---55310628041.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1e27c35a5237741cd4148ec8addc2bc9/685289800.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rinadujifafatakosime.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/dolil.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9edec69ab554aab2310f3b7f837bab4b/61413118381.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/duralenogevezukadaloreroj.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_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 10612 bytes
SHA-256: 5bbb4e88d11f3cab5c29a3ead5155cc9d536231324ee86679a40d14e6774a387
font_01_sfnt_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 14268 bytes
SHA-256: 1dd112980371e826b83ae5d47bbd5b42cc112617c620e947dd9785e12c78bd22
font_02_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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