Malicious PDF — malware analysis report

Static analysis result for SHA-256 844b17269e35170e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 02:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7169a2e73640b53a2d51e4e14336030 SHA-1: f912e18c38dc462f6916e3f06f507ec24e419d06 SHA-256: 844b17269e35170e3fae71113a22c53e0cff5324d72def449a2d96692e2ca472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with heuristics indicating it's a link farm on disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://philabc.ru/uplcv?utm_term=nitro+jump+racing PDF link annotation
    • http://tinhdauvietnam.vn/upload/files/betenejovezefisatu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/42116125986.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911130331.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/80960717257.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/wilunu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/58028238533.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/tilijoladivovinivabatejef.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gozitazipakovuruwakuju.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/fuwufapuzikarura.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/25522925151.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/lumigemazezapatemunar.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161468c385ba6b---79956689704.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zurivegumifoboberadife.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4e1e1a77---26486335505.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/mosirapabisonemerab.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/29201009131.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/3371125714.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/tunejuxagefekizon.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/kesilukivusemazakaki.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/durunusidomip.pdfIn PDF document text
    • http://wwsm-us.com/files/file/90609088047.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/lutubagovapololud.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d4362ae8925d00be109ed39d978276b2/rafadegere.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/vugirirow.pdfIn PDF document text
    • http://4bx.pl/public/file/28371412975.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lepekuwime.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 17668 bytes
SHA-256: 51dc9d5c8f2c2b3940a5bce407f4cd8543d871ce3d9f82d9a5cde7843da3caeb
font_03_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 10576 bytes
SHA-256: 29643806b9ea92b9aa1c52b868e61f5651cfbbaea1f034347813b31a5d22fcaf

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