Malicious PDF — malware analysis report

Static analysis result for SHA-256 d455f383f405ed3d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 04:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9287f704b2ea157cf1fcfacbe22c04a8 SHA-1: 2973a0e1818657754d9ef6ee9ef6c0dbe02f534c SHA-256: d455f383f405ed3da02f03977c5f65f041e4d74067da61122b35967afbee6527
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://yasairamenbar.com/uploads/files/87486423745.pdf In PDF document text
    • http://terrietanaka.com/library/files/60260200076.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kamejeguru.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sikegofejowubenirol.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/gemaliri.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351901310e4---duvuwilatiter.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/bofopukewawiximusox.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/11983502662.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/93268064639.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/wawutuzivo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2fef16c84f92c09e27081612d634bb6a/91489401247.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/9096286819.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/parulususemoposuvojozov.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/612590926.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/94214992439.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/46699379803.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/95133009856.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469e5fbed89---82311333576.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/bagowobogejenubakif.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/36893068576.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/junasetuworig.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/lerijijolofi.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/75163406601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rectus+abdominis+diagramPDF 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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 10952 bytes
SHA-256: 6ce9911855851ff25991a708de9a5e9be46c35d4097d953c76128d3c916aef1c
font_01_sfnt_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 19284 bytes
SHA-256: bb6cf0344246ace25f2bb36921ec0fd4c43cd73c2882e86dba3bb3753bc3d98b
font_02_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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