Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89e53c919411ed6…

MALICIOUS

PDF

82.4 KB Created: 2021-08-22 01:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82be5aa77ed187b50b53dd77befa6e4e SHA-1: 977a0ed890ba4fe9d9a208a08213d83b1c352e39 SHA-256: c89e53c919411ed605e0e7f7b79f17bf8c07cc866e89bda9d61aceee3be5402e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.espace-hotelier.com/ckfinder/userfiles/files/vabexomumurutum.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b560a7ac8a33df4a180ea8bd871b2550/pojugovawaroluwejejaz.pdfIn PDF document text
    • https://ismart99.net/upload/files/liwezadenuboduwigegigo.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607006bf2fce9---47300518994.pdfIn PDF document text
    • https://dacola.com/upload/files/26022865115.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2e9c6db147d808516b72fd52fdd190d7/figisejurosujegezam.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e4baf857e076988db58cae09808fc68a/pevimujofakina.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/m1gsoaqnh1n1qa2q7t5gnghhf9/47994863048.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/32377466638.pdfIn PDF document text
    • https://aashianarealty.com/file/tobixi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f868a57c4f---61579334054.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b3d47df95---94607298573.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xiwijesugexonar.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/095becc45592a813b67627448c1e005f/94291165865.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/10186168373.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/jesufadolorularuzasus.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sepekezegemofibaf.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f56372bde---fejixerosipexirasokalawis.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/34230311992.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/61512136415.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1cef16be---41360546122.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080589d1be91---73770236890.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/33396465658.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/58803732613.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2a4020e37a5bb32dd5523cb9015c298a/dozogetolisunokuxuzovuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+renew+your+bls+american+heart+associationPDF 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_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16644 bytes
SHA-256: 11747a73e95de426ff11cb413dfaafba9014b43ffdc7fdd00f49f43f1a6ad18c
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10924 bytes
SHA-256: e377005e15b3f6aea07c692c46c02e73985f42bd4a161ec21a2708d8d3f8e540
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1