Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3205e8289f892b5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 14:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 818edbf04d6ecc8aa35347d87040fdac SHA-1: d5136c8227acb2556f5f2ee45116becb6ceec33a SHA-256: a3205e8289f892b55755246478755128b388495db40f2f75bdd4b310e3ceeccf
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files hosted on various websites. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to disguise malicious content. The primary function appears to be redirecting users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3069

Heuristics 5

  • 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
  • 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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0c35d75a73515869b08716de15c0b700/nugudabegenori.pdf In PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/falawotugarome.pdfIn PDF document text
    • http://rococosofa.com/files/files/42001637579.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/gefuju.pdfIn PDF document text
    • http://gibisch.info/files/files/motebewulirurepebalozuto.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/89866266411.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076da035274e---tilesutu.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/86727184406.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d41145561---28642203181.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/98013235830.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5b1a98470cb385be10db0cb849b22ba0/mosawadufujapasizavin.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/45391983484.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jj4p7tf2nq9obqg32iaht5bc34/dosagepezibon.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/kedurixijukitedafalebo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/360ae84286be283bd524bde7ce2f9405/fupijotogaderemodikomud.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e355f72840---13759531070.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a32525ff2a9174b15647b27a1c0fc59e/lufofevunafekef.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/97635550335.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bd23f1fd---ferofufotavofuxamijuxowa.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/mitofatenuju.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a049903af18f318368c96525dfb3eb10/benajebokukewusorawizu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6da634b3---43823664690.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/70mlhk6foc3dbr9sobvldhcpsj/31196460485.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jss392a9ohp9r1rk4i40elefs2/xalakixosaz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/72qfnjri6gcdvc0vjtuu1q78b7/16409402141.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/49580081506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=catalogo+redutores+cestari+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 19064 bytes
SHA-256: e30ec5f19a61fa82a88cd326e3511d54bc241ae490689c6ff8735ffb2649fef1
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10820 bytes
SHA-256: a48bff655a1aa398f6d51fb26f954561a4ecf40bfc1974bc6028be0ab33fa0db