Malicious PDF — malware analysis report

Static analysis result for SHA-256 77977443fa26af5e…

MALICIOUS

PDF

91.9 KB Created: 2021-09-03 13:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cbca0f36d764c0f43f15194205941b4 SHA-1: f5e9541e4f024d2ab20feed233593b89e43090e0 SHA-256: 77977443fa26af5ee36619b27c8cec77e5bda1cc6822ab075f21322a770cc751
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or credential harvesting attempt. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting, combined with heuristics indicating an MFA or one-time code lure, strongly suggests a phishing campaign. The document's content, though heavily obfuscated, likely serves as a lure to trick users into providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bf794c2b1041f5b0476f72fb0358edb0/taweramoxig.pdf In PDF document text
    • https://taksis.lv/taksis/userfiles/file/topusatuj.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7dc34111eee241bc9f50ac90a85e0266/rinidazepofepodefe.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/78072356151.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/8055140672.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e6a2cf9d---wituzetuveg.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/ronetafovurepuba.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/2764665955.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/gamikero.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/kipugomukup.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/vuluxotej.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b26172c4---bogugibuxuzuxozebezerosur.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4e9b7f2123ac2bf42e14f78a1a2481bb/34472440363.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/jowovowarifuvovagixu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/furubavofifudavuzane.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/e03pvr2ulsuavf5hqv0jp8o871/56252219119.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/selijugadipazorezuxij.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/98163098642.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/951329d077f4e05fb0f1bc75ebeeb1e7/91358920033.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e176dc20e---tuvuniderirogifef.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7ccc05d5672cdd8b2ba69dc97233405f/38446446779.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/79579868012.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/demosepuvemejuxawod.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9604fb---sozivimel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=refactoring+ui+free+download+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_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 10860 bytes
SHA-256: 26fbe9e9a36acd19ddb7dd1292b75356327b4edc23382ab5c4fcb6d3a157a8e1
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 19648 bytes
SHA-256: f22bfc9ed238e483f1ed20ef2d8ca9df03ca2bac9fbea6673214b8f1d53426bc
font_02_sfnt_off0001498d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1