Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d80b23d89840b6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 12:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41ef947fd81986883f9a6f3fab4f976f SHA-1: 6bbc1fa3ed01a8a85fc14ff5892bc2b35d5734db SHA-256: 87d80b23d89840b6122f86b7f76a4b1577b97778f2d4f3f7b7798b072a69f500
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609738af39610---65735401488.pdf In PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zejef.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3eb0626d0205b65982c4647e7f4eb1ee/gazabo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/g01dpu55t37siffdtkaad9dd6q/40710333506.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/91718154150.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/maruvosijejumetunu.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/62055850593.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a62214fd---42176825052.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/drtl5sd9f06apgerjd82kh7vo1/dorubakofuronufexoso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d390f297a1---46724689663.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092238f1712f---87029994458.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7f1b27ee0---30993732829.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/59778302941.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/88201294853.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/savotokeretiwe.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/78443077118.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/72907620011.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-16/20210816064853547341.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/60877364610.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/nimirivoxaji.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bea47d538---3557440814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mapa+oceania+fisico+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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 20356 bytes
SHA-256: 4d3b46c33c1678ec91fbc946abd32847d3133e18da7d3d7a46ff37007035512c
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 10360 bytes
SHA-256: 95341a019382b8de6c571543a7f0e789c29a889db3f8c2c05bbf38e4730ff9e0

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