Malicious PDF — malware analysis report

Static analysis result for SHA-256 d995a3efcfae2592…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 23:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd3bb5ecfb89c3dc82be30207f621aeb SHA-1: 3659f34ea717ef621a5d1b8779dc16f093ecb652 SHA-256: d995a3efcfae25929d46ccc64c134c25f02ac5499f02a8a762f200b85b55a702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on various websites, suggesting it functions as a link farm or redirector to potentially malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/095c5efe8a6f895275fcd8215d21c3ed/ralagidabutel.pdf In PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/dojed.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xixixatopemelu.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/67577884144.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/fogudeletojipedugi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/temabalumosapezupokega.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/rijuxidifeke.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130847abb17f---kerezenosisavovezu.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/76655989451.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/sigeluluxojunijube.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gidenufiw.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332216ec1d7---18071210943.pdfIn PDF document text
    • http://aweibel.com/Photo/file/kedozemogobojelabonikusu.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/koreroviketol.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdb3d5659---41028000099.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/13159206041.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/rowilej.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/vulowakofakigaviki.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/turisa.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/ruvip.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109080320564885.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/fafumoweboramidujataxo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/54033564039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pubg+global+for+iosPDF 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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 10296 bytes
SHA-256: 9188513f5b94ac49d6aa562656c5748dc031b97cce6637cf5b5608aaf5419b45
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 18592 bytes
SHA-256: 51398ea51dd4281d46308c9f7b462ebe3a021b5833276f35edc23ec3f6ba00b6
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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