Malicious PDF — malware analysis report

Static analysis result for SHA-256 558adcb0afcf6829…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 04:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a08ac31f6bf9a6659319ddbe70684ded SHA-1: 3574d999654d7033911773dd8cf428a0619add04 SHA-256: 558adcb0afcf6829a7a674ddfed28d5c9e6f1e93045dba313ee0be5fc3e91901
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160727d5a33a13---dirupipuroma.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf261e8c94---24050821073.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/sajaxepalojug.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/berol.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4699e106---nofutunexumilajip.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6c15862f---25337583180.pdfIn PDF document text
    • https://wsbtitan.com/images/file/fatazegesimuned.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/66483589437.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607832408954c---86565403059.pdfIn PDF document text
    • http://gptools.net/userfiles/file/55247082084.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/62995462422.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6026243e0---11535984998.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823ec9cea3---14169869101.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/54602674282.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/murawowozuxokoma.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/gazuvibelaruwumotate.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/10192320659.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067383608c---minojopididokog.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0b8323bb---38534525252.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bde06ec9a9---38722939192.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1694b7130---wikidexuxujolixilumo.pdfIn PDF document text
    • http://chemicalengineers.ie/images/26400094301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=k10+depression+scale+pdfPDF 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_off0000b607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB607 17620 bytes
SHA-256: a6e5ec6ba797e04af51cfdc60648917675697aba231cf48a594a9a6a4511ecee
font_01_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 10680 bytes
SHA-256: d21a2a279f0cf22ecfe802d5fcdc50d33be5beee235ef7665fa99b5daf0caaed
font_02_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.