Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4308aafd49d44a8…

MALICIOUS

PDF

102.9 KB Created: 2021-09-13 10:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e1d27c301384cf63ed1570c2b665306 SHA-1: f7c1ca136e08445d296e818119e2361193f43eb2 SHA-256: b4308aafd49d44a86f1fdd0eb0568e4e1c42d2c729ea5c309f215d31b3f853fa
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially malicious content, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bitree.net/ckfinder/userfiles/files/75118039347.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700d413cd6---nevifamuwusurire.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210912135546.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/bifalupituvezozenef.pdfIn PDF document text
    • https://mangallagn.com/images/file/73835101578.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/47671406500.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zitonikuritopijakurexox.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/memazizaxini.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613000ae99755---sefagududafatejoxopu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723af700e3---xexini.pdfIn PDF document text
    • https://telenovella-bg.com/files/78089889439.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/u62tj65l7j5cpf9agb1m3k1pih/98104927350.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/42312428237.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/23403685493.pdfIn PDF document text
    • https://goodline.by/userfiles/file/15900840119.pdfIn PDF document text
    • http://djapm.com/userfiles/file/nimasaxagupepif.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/8944874653.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/54849849427.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d577209---29913089895.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/uhm3lqvpcadvev8800it2sp4p7/rikafefara.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sodokaliseliligumodexa.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cd504c33b8f4caa90a8426879ee88df5/36201719912.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/nasetenuxi.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/98612033878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=legend+of+zelda+twilight+princess+emulator+pcPDF 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_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 11272 bytes
SHA-256: a67f1fd7e0f9dc1920ddaea4b17686bb8901d517da0df4686b1cbc7f431811d7
font_01_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 18256 bytes
SHA-256: 8edbd25465a1751927a7499790e3057e42e0d44946ab757e6aa0b894ad55e359
font_02_sfnt_off00017500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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