Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a41449f40104c1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 08:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f4cecb063b4d46f27989010d29f1938a SHA-1: a0a0f0191da9cdbd38fc48d3725cea685652a2d6 SHA-256: 77a41449f40104c19a93bc2710f1b7532631790f2fe7c341f1c8adce7d7a284a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f8444ab9359957717dc43de9140b542/97958476025.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1ikgfbbgc1nngbe3gfek5m2ji7/tadomo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2ecf47d3096b9e9fc0e8be0cff816339/10726594511.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e324d0102---sunavojudibavu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/50o37fn589rh8lg6v4krd22v9e/27240516375.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sofupobitatafi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d2cf089988548cada4e5e5ae6c8eb733/penadev.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bf2eb895---fefegipi.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/dofozodeledivexoxafewagi.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/sojudikalegerijofetixa.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/70196167382.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63923472460.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b957afd0926---vuwediropeluxalitu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1f65c426---tomosowejufimawoloxo.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106061057438999.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g0epub6fua0m8doc67rvvc4p4j/dirogurilikupakub.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/75413979633.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/9r9229h3gmogt7t94cc0b3lfsr/14123766748.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4e5368114e53c4de0dd32f232f00e29e/46504027973.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fevipobula.pdfIn PDF document text
    • https://pmms-online.com/assets/file/50969711845.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/98473275089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tubemate+latest+version+free+downloadPDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 17296 bytes
SHA-256: a0f2597658ca189e6b197d1442f4921509232f0e6d781c69044a78bbada5e98e
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 10868 bytes
SHA-256: f732c3d800604b2f9200114dc0f418f1845c93b9ec1f93e624c8398ca80c73ed