Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cb756a0a25d00a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 06:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1632ab53cdb97e453702d36cb14c9ba SHA-1: ccaf301664354bfc0f25f06b4b2064aa202f24e7 SHA-256: f2cb756a0a25d00a2b5600c621a04e579508f246225303a96d2b7656870dee27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary function appears to be redirecting users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://auxerretv.com/content/public/file/zesutalovoj.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed21c7972---79961666259.pdfIn PDF document text
    • https://europartner2.pl/uploads/tofobiwewizipo.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/zurakitu.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lubosam.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/41362822417.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/wawulijapujifijazavo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1c32ef98---36931242692.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/xebodelujaboteki.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wefutufemasudisele.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/23559444898.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021082512050086.pdfIn PDF document text
    • http://agermag.ro/mm/file/86667200312.pdfIn PDF document text
    • http://fitviewer.de/files/file/widigomepopo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1665b379b---lagapedub.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/49615757913.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/88260397426.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/nuporufiwefidogizi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b728b97e44---96618511016.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_215926_100.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/javazejetod.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/negudibuzibokafubega.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cc8992a01fd1a62861b7b22bd3856532/66787613235.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ad42f2c9---33938976797.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b37234f484b6a90c6cb305a5fa4f3f3d/bazopazogejexu.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/40701164619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=aciduria+orotica+hereditaria+pdfPDF 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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 17840 bytes
SHA-256: 7811d9932c6f5e4f6688a2d5011aa4d22fe663143e7956f5548a859aff74c047
font_02_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 10480 bytes
SHA-256: 4e81ff2beb2a724ddceadc69da7f65378f99d3e7048b1f226b3047fc3ad28d7a

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