Malicious PDF — malware analysis report

Static analysis result for SHA-256 34090484b0ed6f46…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 19:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74098c93ebcc9f26f68b84fbace59f11 SHA-1: c6a2ea38199f6ab3d5da85b774e36ce95e7b1487 SHA-256: 34090484b0ed6f46237483358cbd0e2fba3073cd91d6981b7862c6490c627d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, with several heuristics pointing to link farms on potentially compromised or disposable hosting. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bordahusfeldolgozo.hu/editor_up/16472543727.pdf In PDF document text
    • https://fa-vietnam.com/webroot/img/files/99302044341.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/76678412340.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/28839131665.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/wavafarovedevewarifi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/muraxoselu.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/87760080453.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/joritududeborubil.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/kibaw.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikugakasafuxet.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4rp67fkop9t1t879g1176bus85/kurira.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/68333798837.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kufidegizej.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tazinefawenefor.pdfIn PDF document text
    • http://jar-ted.pl/file/63113931628.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/furokebipalowa.pdfIn PDF document text
    • http://isvpro.com/custom/files/22416985797.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ea09a1d7---63270221290.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5572fee---99266846685.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/86152040768.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90066327726.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2dc8935---10992850342.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/titefudukexezar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mx+player+sound+not+supportPDF 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_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 18328 bytes
SHA-256: 4d1e956cf4e93bef8622a21f17c390566ebc5a1a5287f9709078d089f75da118
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 10604 bytes
SHA-256: 8888a2efcc9a063e8e13bc6ac899e3be30962b971812236002cf9039a06d8348