Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fa7854e48705e5…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 22:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4822cd85b791b497ef30b97783b0de13 SHA-1: 9b324b1839a8c97a72cf6d3ed3b791bb45abd8a6 SHA-256: c5fa7854e48705e5c839905b8bc77f3e8f6f64811cb6b67a8e904630e3684dbf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with 'utm_term=gta+wanted+level+cheat+pc' indicates a potential lure for users searching for game cheats, which is a common phishing tactic.

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 https://ketchas.ru/uplcv?utm_term=gta+wanted+level+cheat+pc PDF link annotation
    • http://lagunarent.lt/ckfinder/userfiles/files/49698069730.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/27316366735.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20446962973.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109031929579993.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7bf61ef0---napejonupanolurewow.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210910014441_63kjx5.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/35466169467.pdfIn PDF document text
    • http://umhouses.com/uploads/files/83406475749.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/darug.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/39144205756.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/67526925432.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tulagarubupepopufax.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d022650da---wenivumibirodirobewe.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/pasanukixikidonu.pdfIn PDF document text
    • https://mollis.rs/files/nanunino.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210912_ED35336B6C3A747D.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/2525016117.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/46673430231.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/sirataniromepuzirebesa.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/badofemofeda.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16145945749983---tunakaxotododuvizixu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f613aeba46---fenemevanamazixezoza.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/76499115691.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/fijosiju.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/632576864.pdfIn PDF document text
    • 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_off0000bd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 10324 bytes
SHA-256: dd0b1f73be9e2a1b2b5fd254bac7d001f224c3b1facc36475740a20b28243faf
font_01_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16480 bytes
SHA-256: d49fba136464e1b402771cc0266d50a14eae43548058c0bdd29bd44777e1a5f3
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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