Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ab6dcf138982a3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5918e791935798c3d7e7620f75b56fb SHA-1: 10bf95112cd657fb5836e2d6f0377777d6093e12 SHA-256: b5ab6dcf138982a37de31f8749ca466e706701701ed7ef5ac6badbd879dc6c0c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'wkhtmltopdf' in the metadata and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest potential exploitation or abuse of PDF features to execute commands or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://miraclechuppahs.com/userfiles/file/46818044114.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/06vif3rg197fp91b3ud6iomgi4/64262887049.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e54394808---13577117531.pdfIn PDF document text
    • https://tigaintan.com/contents/files/xivajidow.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kd29p15gipkdtuklrntseglq04/jotosejetuw.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/sesatas.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/18019162058.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/31356671622.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613594f7d99e5---52227721595.pdfIn PDF document text
    • http://becucci.it/userfiles/files/34773248348.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rogoxifodilogawaben.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wavetubetumozoridega.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210904140634_623951409.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/91172986739.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/lulowepivukunavanu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/89062847255.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/34496556946.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/62048400931.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kimavurobepijelubimire.pdfIn macro / runtime command snippet
    • http://leadershipcareer.kr/fckeditor/_upload/file/65707898963.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/s250aop6tfvq99ltnep9g7ujr6/67851059055.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/29784842815.pdfIn PDF document text
    • http://newabel.com/ckfiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=picsart+apk+for+windows+10PDF 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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 18008 bytes
SHA-256: f8dced194b8b0b54443ae24658ffddc75adca35fe987b04cb28f6a634521a1f1
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 10788 bytes
SHA-256: 603d39a206230ccc0e1671dfe6dca98f8005db7f5eb95701475ef43d0dfa747e

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