Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f473607fa9ae7e1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 01:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 639b997b14540dfdea341f3339af6cc4 SHA-1: 1d7c22d7778821df5e5d3ca37cf92017d2dab4ca SHA-256: 6f473607fa9ae7e180430e7efa0a6db74203da042eca85d523bf44347b42b7c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of multiple links on compromised CMS upload storage and the use of UTM parameters suggest a coordinated effort for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=sop+for+supplier+approval+procedure PDF link annotation
    • http://anbao.vn/uploads/userfiles/file/63724051312.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/j6au9isg0tk3p07db0oh81u4tq/tobapugujuromoket.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/44155247814.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/d910ugugrqe8ome8edq4od69p7/sokixazoropigavifa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f3b362c34d3d8cd991e118ad318fbb46/32005921343.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ca7e018e---75081595739.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1h64rmcud8ls9vkab5uuakicp6/gilepasugubovajipatesow.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/fojivujab.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f59bc6abd83ecf4cb242cb26bafb7194/fuxofumifi.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/m83fii67uvdod3ga6t6stkectq/lujawukovopofe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c176607847---mevosapu.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/tosaxozenil.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ed6e413ad76b6466b050ed600d261f61/lisibezuzebamajijinu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2g9bcepmb6ermv7jdte20dhbn0/49361108005.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b556f158d---lolukaluniribarikitut.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/nusowivodikejipubun.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cf2c17fb65c73b8ac707ffcc3288b1dd/53590709319.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/sasoraramakir.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/16486574989.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/difoxetopileto.pdfIn PDF document text
    • http://idroter.org/userfiles/files/bitigekewakej.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/51932079600.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/97069341557.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081510282043.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2daaa4f88---23347124074.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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16900 bytes
SHA-256: a5c780b5271c1445c4325371b2b178611b3f05cd2214dd21e83998ff1e1bc33e
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10652 bytes
SHA-256: cc6e47149f67706d78e79c9a0569445e76d637970dcc9a3466cca4ea255432e3
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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