Malicious PDF — malware analysis report

Static analysis result for SHA-256 23545cfee650060b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 23:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6b506dd57f33c6d3c99ab2bc5f2c43c SHA-1: 7eb76b0f9eecfc2255e0f0cee52e0438ef68916b SHA-256: 23545cfee650060b3fe55f0cfbde470e7c1c9d74d544cf4f917595bfb69bf6b0
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/vamagufiri.pdf In PDF document text
    • http://kamakuralosgatos.com/uploads/files/46552378713.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/63873116095.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7b9dklesp5i7baamn46ul3gumh/naludezegeramebibo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc40ea893---60874884172.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/11584489520.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b63b88d41---19845631465.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/662de14bad4edad56aea433286610710/setamowojufos.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/39020803104.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/1126715617.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/vamuvetadowaxipot.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/93443970965.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395f557c8e3---44363294377.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/nawisukovata.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/pubeledanazagomodofe.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/39599609159.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/pibamabomujela.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/17150957701.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/21788536484.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/sujekatis.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03cce61ca---fevojopefa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62c3c60e5cdf98bede8aa9098882164f/44673091173.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/42884572509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dnc+ejemplo+pdfPDF 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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 10292 bytes
SHA-256: 42c7ad6b2642e1ddb46b980b6ae37f54ac9f37ff54801dbe37ad2f6a0c4a4aee
font_02_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 17804 bytes
SHA-256: 82df5de760c35855cfac7bc8d69cf2f1f0e3e2785a495948f12e02149860a886

Open this report in the interactive analyzer, or submit your own file for analysis.