Malicious PDF — malware analysis report

Static analysis result for SHA-256 577b350d89e09440…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 05:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4b7c69dc26358141ac8bc64078e3f6c SHA-1: 2178406c5e034c4e9ca342c8fff3bcb44178c0b2 SHA-256: 577b350d89e09440a398e367bb191d561c991598ceede7e363c7141818cd3972
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to manipulate search engine results or distribute further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a potential for callback phishing or tech-support scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0958cc22b3a1dc2101e1241b2d54c4a7/5568456878.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1cb6488a6b289f09cff5a7894ed68b8e/kawebukovowabe.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/93971067798.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zedijupamav.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae3a36ba39---dibakakikubite.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7dafb47e0---votomijogukiniropulim.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6f31ebba---51558615988.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mujumapopevupim.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/wirilikodexod.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vuwititixebodinopixi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/8108608020.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/45333814637.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc22fd62857---kijezazezoxotanupefafarov.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bb0a796a345bc392d405dd8b6a3e573/39591180939.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84e2574e6---mipoxof.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1aa195064---19634638366.pdfIn PDF document text
    • https://tigaintan.com/contents//files/72995775514.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/xepitar.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/f2lm406dim53dgg6oihg3c9ms6/jinivewajeb.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/99528332260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+power+of+vitalityPDF 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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 18636 bytes
SHA-256: a4b9b226c764a83b5ffda9832fb1350216bef0b9580ee9397c06738d73961c0b
font_01_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 10412 bytes
SHA-256: 9c20c25bd43e29629f01646e76ec2b5343d870116b6278a5555f9b12476479d2

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