Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dd1af7dfa7a4f1…

MALICIOUS

PDF

98.2 KB Created: 2021-07-15 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c89a2df2b0c832770c14dd17fe38be4 SHA-1: 06b130f6d4fb6f09f1f065c9aa2a790c22a43730 SHA-256: d5dd1af7dfa7a4f18e481daeeb0cd2e2248779a70c1d596dd195a495fb98707e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160920b441d817---remazakovijame.pdf In PDF document text
    • https://epos.nu/ckfinder/userfiles/files/97504597130.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0475239ebe9a6e8d6294eae67291dada/sexulunifefokef.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5f533ae398da260ea660332cc3b4e33b/sixufebewijisexumurusor.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/todakenakofimigekimujuris.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/eb1176d2b889ec0610c2777d021a3455/dilas.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b954cdf27d---devagoxufugigaduzevuvet.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1f6839e4975cda5f89533e15c36af77e/95456599316.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae76026bfee---4284024088.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/65810515943.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/15827654338.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6a946b97ee150cc772321217437a8a3d/93514723294.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/97527096541.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/034c0b723f93cef1364c5a98f7a3785b/jukeveji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d816838e---zuxonidofifetijuxox.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e009b97fa---geretifoje.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4de75978b8a698bb4e495c3c6bca66c7/veram.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/zulegeseredevexorizej.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/gebikowok.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d87b9175---80187313889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mcq+in+computer+science+with+answersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/73704144196.pdfIn PDF document text
    • 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_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 17356 bytes
SHA-256: b8db1dafb0a69e1edf2426ac85942aa5c7f3b5ac49ec473222b06612501aec77
font_01_sfnt_off00014a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16285 10920 bytes
SHA-256: c62d5f9e51222de76cdf86317f309f6618599b53405221f746acc94b8d682579

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