Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c804cb0258d5c2c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 08:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8750ae75489bb911cdad0c194f532ec SHA-1: ee05db903eaa3a96151bcbc16bc6bff429442a25 SHA-256: 7c804cb0258d5c2cdf7741c8a74eb2e71bc464073fd56009284bc4898397cfb4
216 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to external sites, including compromised WordPress installations and disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates potential command execution, and the presence of embedded URLs aligns with spearphishing or malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wendi101.com/userfiles/file/difipusosivozelokak.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161385dcd3e499---43283094540.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/japezokulegenamuno.pdfIn PDF document text
    • http://rurisnet.org/images/file/78196572788.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c07d39c37b3e2d02673e333d46816486/gejelifuwisumijuguw.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/80385359091.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/pivosoma.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e74741174101fc82983c7fde9c35caf7/73947280021.pdfIn PDF document text
    • https://efnnma.org/files/file/wugewifazowera.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/97913351545.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904191219.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/52957528999.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/gefikegazapozobip.pdfPDF link annotation
    • http://banner-ever.com/ckImg/files/93892721.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/46935349347.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/62375244879.pdfIn PDF document text
    • http://wajl.net/img/file/20219343025.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/56646501704.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/83516233737.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/zemelironeminozufufewoxux.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/dujevigupim.pdfIn macro / runtime command snippet
    • http://www.css-jp.com/upfile/files/2021/09/06/kadegigaxuwomiwuzapotudor.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/55698070265.pdfIn PDF document text
    • http://unitekinfostructIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bud+farm+idle+hackPDF 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_off0000ba23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 10496 bytes
SHA-256: 77524630d9841cde28df2c3577ec3493d5c32dcdcdeaccabe96a7e14aff6bbbd
font_02_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 18016 bytes
SHA-256: 73e684ba7014f8ce4adf882a281a467b9eb0028dd97702690579ccf7558b4658

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