Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a687d9d3b046ca…

MALICIOUS

PDF

74.5 KB Created: 2021-09-29 02:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65d7e7e714f3f9a0e4ee8403ec408ab9 SHA-1: 7265b8e5be2ce168eeb86eed12bd14e9759910b8 SHA-256: c6a687d9d3b046ca135a582d8d53c4de7fd4f1037c74968cc67db8e733e17d0e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially harmful content or facilitating further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://jamalcar.com/userfiles/file/34795540214.pdf In PDF document text
    • http://citysoupsbellevue.com/uploads/files/48393565870.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/9121846148.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/43241732461.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210929_D5D9743AE99D8956.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c00c9714---mopikigunoxeterikerugoji.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/finenaxufakatozuruzeju.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/vorunopenixa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151c85257771---19498994547.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/bukisadetakexurokemipato.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/76015297716.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bbb0b565b---2392006769.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/20973295830.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/zopubapipupubiguxiguda.pdfIn PDF document text
    • http://htcable.cn/d/files/zotemexijogigafemesu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/laxef.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4eb47710f5855b8ef77932c0a0ea5d73/40343188921.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/novisesisikizugaji.pdfIn PDF document text
    • http://vecsecity.info/editor_up/sujenadexaxebatapad.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/64557174623.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/54900522469.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-15/20210915185757898585.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/51651024858.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pupogotavitudafurasovebi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/puzomi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16153917522f5f---3921967865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shadow+battle+2+hackPDF 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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 10516 bytes
SHA-256: 1e65dd837866983e110050a5f3b7d575938f7adb7d741db4d8d18c57034bc1e4
font_02_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 18708 bytes
SHA-256: 5548f902e2a9fcd33281da6d3990a10ece1858ffb98edd1e463f20377f98fb83