Malicious PDF — malware analysis report

Static analysis result for SHA-256 56abc93f18f073b8…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 17:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1b14d1d2dcc8e5ed7547995b39e62881 SHA-1: d6d8803b5fae45d694ca9b90a472e15e5eddff12 SHA-256: 56abc93f18f073b8aa68e13cd5e9d38d8f97d4d0efe6f0a8b031d42dd6b18723
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary goal appears to be redirecting users to external sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ersatzmonitor.de/userfiles/file/wufoputip.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85a2d825e---82825198515.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0eb6f0e8cb5c65bd3f706724ca516ddb/gelepaku.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/namekojekosixepejafiv.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae45b31be0---famino.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6a50ffb4a8ad2801b12d059a2249b8a6/61636530776.pdfIn PDF document text
    • https://togeltop.net/contents//files/kuzajukozuzo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/25441636635.pdfIn PDF document text
    • http://zuche0551.com/upload/file/jurigokerazitajadivod.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62e130149---webagesogiz.pdfIn PDF document text
    • https://afayl.com/userfiles/file/95635633501.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1626206045202.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28eec7b3a---sunexukowezazubezalo.pdfIn PDF document text
    • https://rosycaffe.com/file/89670840271.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/farezatomorego.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/bivedum.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/maxadobijekowen.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c5edf756---48336502710.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffc318d2d---66763150274.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e87afedc---baxitupux.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610859c09b44e---19240654334.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e472e6314c0eb9a3215c0d4b77f3e9dc/posapemepegasi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/86b0f139d873b3487cb1373af1270cb8/nusawebaxasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pearson+algebra+2+common+core+online+textbook+freePDF 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_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 18284 bytes
SHA-256: ce5a9e819e96156a2e44f2bb6270a52447cb23c3ef096a7ddd35afa85f39c092
font_01_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 11136 bytes
SHA-256: 0290ad99b9a6a4042b10476737f655326915de5d8f486b3081ab49159bfe0b73

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