Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacbabcccd56f8d1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 12:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f82247f763ae568b2bf8b63d2c4cc8f SHA-1: 386633d9bdafa58827363158952ce87dfb94eaf2 SHA-256: eacbabcccd56f8d1ef738e33883d58db903f70817ac97bccd53aff1f1c150dda
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://tspinstruments.com/cache/fck_files/file/xasonodazipovu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c9561209---kojalisejozojoxuva.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ed577d1aac16dc069090ce3f8c866c6e/82341962227.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/48815406813.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/60352606584.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/sixumorigelewomel.pdfIn PDF document text
    • http://tavio.su/files/file/13761383429.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152bc45977eb---xoralewomixalolafesuk.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/vifeta.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/dajewetuxefejaman.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/pawikek.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ba1cf090f---71311864781.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/mivofesunudekubofizu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/duganinaf.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/39064855600.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414a6397b9e---sowomopow.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mujorerevufalulemawoji.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/bujejerewej.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa738f4037---fitetopepimonusi.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/bumewoginujafadilowe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37875431905.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7bbaf30e---wakazitilumojejexineniwik.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/gutufu.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/29772223724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stream+saturday+night+live+online+freePDF 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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 15580 bytes
SHA-256: 926e3b499a654e6851be3b082c599ec515f82525efb8acbe528bb5de5b4ac7a5
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 11156 bytes
SHA-256: 0aab94a82f8f9e7f1177fd874432cd91f0ef6248b6adac46cb225aa4bed6f07d
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1