Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2704e100eb5ce7…

MALICIOUS

PDF

95.6 KB Created: 2021-08-19 23:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab42bc635444620cbe27b8b9f0d5b185 SHA-1: 5d666f71cc3cff93e483f791b7d84a3c0016a33a SHA-256: 8e2704e100eb5ce79f1efe3fe4c2951e869e40b4ba7060ea16847086d709d8e6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and numerous unknown URLs suggest a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i1l6pigsv0upatldpt68tjncj6/92761218268.pdf In PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leguvexapefurudosafe.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d3cd5440326d9a702ce38950cc34fe5c/zowoziwevoxebimijeti.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/zudazapimatowubet.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/80446073519.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/26690791358.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b20190fb---87025554782.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7e1783e0---50145771527.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d7cfd6a8ed638b7b3f0211846559b9e9/20162175820.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/14bbafb2b5893900a85a2193c5b1ac69/wipuga.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117284e6ab11---97877767731.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/28836936457.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vjtqe6b8erj18sjb295qcq2au7/56575442859.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nigux.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vefexagemizudikugekugar.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/42753995640.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5207b41f1---64182063097.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/birava.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5dpficp224k30gmcalmmqf1vd7/36395810498.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/32192ea36b79e4040a2214947f6ec6fc/repira.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de8870ba2---29819081558.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5032c3bc---sijimovo.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/sefabivuvolujukazi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1usbjf0383s4hom6nucnkmbve6/xajewozevajinomelujejik.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/wavilonexenugalupitomebap.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/48981498166.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/49763394019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dragon+quest+9+strategy+guidePDF 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_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 17416 bytes
SHA-256: cfe42c44ad00877aec8ca020a24a08e0b26b585c11f52d7d0f4b4b24ea8efccc
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 18400 bytes
SHA-256: 1dbd91a056dc98b00d4f32ced3f7d01c699276ba2e81e91f98f93031c6300ae1
font_03_sfnt_off00015755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15755 10904 bytes
SHA-256: cd1ce066e712aa0a3f8e0a5544686e879571efba9d9b0ded5a6eb0010f893492

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