Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c72e15acbcc8b0f…

MALICIOUS

PDF

91.8 KB Created: 2021-07-26 06:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95a90fd21e18d9ef0ddcc26f45e9c94e SHA-1: d15a2eb8178cc75b1080f63ce24573a258ea05bc SHA-256: 7c72e15acbcc8b0f260d79de9fb0c11cd333c68191a524458be8d7829b5fc712
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0420fc11---64220701202.pdf In PDF document text
    • https://aymfly.com/aym_image/files/35710616139.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dixolowujivuwemegem.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/sotavozivukonesagofi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/44996845515.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/96911345641.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/galefubotuwe.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/79270635260.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/dotojipinudi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/99728563583.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/beguwasidisipuxesedeli.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/safasojowuzoxadotikoweze.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/14f194eea94d5a89b4d32717e035e150/26094877545.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/zinuganokudelivumemu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/86109276899.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6c60218db16375e0cba7e21b7caa4942/mebexakuwitametopupiwogol.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d795b657---xasumog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8soojh0o7peiedmos47p1dqch0/baxazazurazizizekedizile.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb8983e2a---60068621668.pdfIn PDF document text
    • https://migger.dk/userimages/file/tipuzizetugekupasaf.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c663a80f79---vizurunajanenuti.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8065e2fa---92932931899.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/5906673849.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf2ba1b8c---zezikarar.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfa7d3531---vewafujivexi.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/54699262297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nigeria+defence+academy+form+closing+datePDF 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_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 10912 bytes
SHA-256: 127cee09d2c51a890336ec63cccb2ecac50c00c97a2d8be112271c302e56151c
font_01_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 17432 bytes
SHA-256: d44099832204af41c0eee32c7c60beebcd58caa7bc29eb5b32a13ec5b46a6986