Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb681b34b5e84700…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 23:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07d6fc0b30fd4446e60c393f94d32b89 SHA-1: 3343c7c2f3fbcaaa1693d602c36dc3c877a8c7b7 SHA-256: bb681b34b5e8470057fa0a7d53c6bdfe3e982bf67187d61bfa0183dd88fefb4c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link firing further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://tavio.ru/files/file/20308479345.pdf In PDF document text
    • https://jobtiara.com/files/files/zolatopuzuromeweju.pdfIn PDF document text
    • http://pvvc.cz/files/domoruvexinugaluragagepak.pdfIn PDF document text
    • https://lapakunited.com/contents//files/jopozagowawosituseriduzu.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/guzamabepemakef.pdfIn PDF document text
    • https://maility.pl_adresuserfiles/file/tofipobidefawoxeseveveg.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/36192886035.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/98877923819.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908bc9c08---30680391684.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/zejagokov.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/90735a40a5b13faa822376d5f9301557/misema.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zajireduvekijuzinemomopok.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pjq64glsdk6e0i46g3336pnj49/98055977345.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/97539104846.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160909cf051cf8---sufifujirasoxuxazisejodo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160764b4fd4ec9---30529277308.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/xobis.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/42464044615.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/bigegutejo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160eda4272994f---37779008659.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16123667367076---wepezil.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/73dc6eb390f07a72781600b3171e55b7/kerisumawoxof.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lldm18o6864jstg15870vbmmtv/91148120023.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f02aed2dadfeabfaf90f15dddc3303c8/pudemiwisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=grassed+waterways+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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10368 bytes
SHA-256: 7d454d029e3b0f742d89b123a81374284217db00159a5448fc1aa4f2982842fb
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 17492 bytes
SHA-256: 7d41a7b5512173e90990f26636738567af21501725fc97ac55c5de2ee4220849
font_02_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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