Malicious PDF — malware analysis report

Static analysis result for SHA-256 188c0fa1414c75bc…

MALICIOUS

PDF

91.2 KB Created: 2021-07-21 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d971c41ed11c5868eadc6f905bd57123 SHA-1: 8c529603efd9a5de0ef29b5220c00650763ba5e7 SHA-256: 188c0fa1414c75bca2a1c5d59da1ab7cf86fe45ae47efbf40fa8fe27882a32dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bbpartner.cz/userfiles/file/95131834189.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ino88ph5e7hh0a8djcg4nppijq/jesetudepiterilagagiga.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eed9424c8---11528157774.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/jrvmhlna5j9p8sjc1th3rb6ai5/96955425051.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h3s3sp5v8hsbn6grkcikvl83d1/21873121779.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/vefuruwunipimanadunule.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p74vnchles49hr7rhs93rk71pt/7793733755.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1731d4efa---12826796161.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/63428116963.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/85f0c7b58fedb6c0bb15850b29941c27/64798554405.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9657b4397c0d52998919f994a9b7b6bf/74452972436.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/81100292731.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tirimoxibugebojenosovarak.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3aed4feb3---13517335872.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9236752---setonomagugiv.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/25623523850.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/sozumo.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/83329948739.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609712d18cb11---4825660227.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/nadebukitokate.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/50676272048.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/xadoxabidakalapejiwofumo.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gupobif.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/fb769b262fc63f4313edcc4196875a16/mukegotef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+draw+a+minecraft+heartPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 10604 bytes
SHA-256: 10c67d37fc1628befd3f5cb6e81c80e7977cc1483e534bd7d3ddb272042f1a01
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 20216 bytes
SHA-256: 9b949841345c2ce60421db99a6be0105217353af485843718d38505072803112
font_02_sfnt_off000130b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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