Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3f77ac4428db50…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 21:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0afac1e3115cc097d5bc2b14a8901101 SHA-1: fac419a73834e5d6ce64272c8bece61c7ecd1f68 SHA-256: 4d3f77ac4428db504727f3475549744b0ba27313d419ac6e859b084f3925bf26
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for SEO manipulation. The presence of a 'download button' heuristic and a high ML classifier score further indicate malicious intent, likely to trick users into downloading further malicious content. ClamAV detection confirms this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leanuslab.com/UserFiles/file/fimikaside.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fa675d92---56709556491.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ebd672b4eb0fef685f3d1201c119732d/zunidaxa.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/divuzunoxaju.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210805172504.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/natli9qe05803kq0p5engf27cn/kokozex.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cb00a4c434267cbf7a59a8360e526516/debokaniwesatubasovuguso.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/90be84ec3564ce501268a73a2f02ce3a/14742622947.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210720_6D47E490502DCB04.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/90737570353.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e778000d76c---15768691428.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/81492177368.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/43854087659.pdfIn PDF document text
    • https://numberonerevolution.it/file/kurototowo.pdfIn PDF document text
    • http://regmac.net/userfiles/files/sotozirupebisuw.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/tefajuvago.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c7054304037008447304ed737af845c2/6236568733.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97c245df6---veguzamunolizutemigan.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/39586969484.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ja0rbqjmc2r08k85nbbsfj5ro2/juralumomolesajegowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+free+download+motivational+booksPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 16256 bytes
SHA-256: 81f0a51ea33821084b53c66cb93cdc50a502e939f3da6a67976a22c52bbe307a
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10900 bytes
SHA-256: 05be4b3436d9a3388b172489e35922baa17cce018813ec6053e7bd32a62f5fe3

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