Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a61424d3c1dda62…

MALICIOUS

PDF

97.0 KB Created: 2021-09-01 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc36e08f0e067ca74cabed9c889c1259 SHA-1: 0a0e2a3a16240d42acfacab1104dd8b32c791c4e SHA-256: 9a61424d3c1dda62f6e21cd8fdc0540d5dc8a2e19fcbfcf01ab906e9d1254bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=in+his+haste PDF link annotation
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/edb9ea5ded4e720b6e5099f8ec4cbdad/38475565253.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078947d077f5---riditewezu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d4c84283---sesojasitin.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/lapuvozeximabokedufunor.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/155ccfdc50e322baf2dbdb79018e25a8/juxebelimavajudalus.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210531041042.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pvivk2mfcnu5mv3btl3or14l40/zoxikumi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68189813791.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/deteripevudilojep.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/siboxonelubigifideron.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dqi1hdlngqr7un82pc62g8vabr/61134943638.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997979ca1a6---21233889241.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8182dcf8640c53fc34a4ab4950f88962/43073068328.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/donovu.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/45729083653.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/10760866752.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/fumafadadoziwuzixediza.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e757c41ffb---87316446005.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/81874317483.pdfIn PDF document text
    • http://retailcop.ca/files/77875528820.pdfIn PDF document text
    • https://ccskin.com/geektic/files/197330714.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ff68dd5d5b5e8d1205d7b920cb655527/vevitif.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/15908385345.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_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 9892 bytes
SHA-256: c71c1fe19738cb8d9ee88d78900fbcacafb2a754ad33ab60f9bbd2a01c2ac3d5
font_01_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 18500 bytes
SHA-256: d6a1a9e961ec46a38102f98f6d0786998dcc95ebbe3546885874a3377fe911bf
font_02_sfnt_off00015c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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