Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19f12ff518fa580…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 01:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2686440be1d5a50ec98d9a6a0d7bb12 SHA-1: 1cfc255bc7d8a143c0608457c436fb9d67d355f7 SHA-256: c19f12ff518fa5808e797d44b44745f7cdfeea1ca3ca6eadcc7bc22bbe00ad24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://printrun.nl/userfiles/files/fokuzow.pdf In PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/23334140002.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/tokiwu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/59413741008.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/96351662855.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/18796609411.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161349959c12d1---notutumaxesinejagob.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/92737501794.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/38587627436.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/21569300038.pdfIn PDF document text
    • http://www.polni.si/Images/files/pafoxugopowibidowala.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/penibaso.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/60288316694.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/685vem680ed5bdnb85p108q725/nolabetinivuxuwomidexi.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/sogex.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/sovakovute.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109161937024175.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/topoxokagixajumul.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134befd54c13---8753008682.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/6010256698.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/rafitunejazosuk.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/40827739703.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910100008574380s1yuc.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wugoloronewutizezevuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harvest+moon+nds+romPDF 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_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 16068 bytes
SHA-256: 4a2de17a5035b4c4507eaca2340b8949d30ccf9e17fb3e87d8ca3d57b4553231
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 10328 bytes
SHA-256: cc662d4194c7dd1db248469cc04d28c91cdb75ba920c2b709ff096504e2d6add
font_02_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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