Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de97d6ba573719f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 04:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e6d7cc89c8cc145dfef22e1f975e351 SHA-1: 0194b51fc2ec61d5d292b93e401d8c465fcfc87e SHA-256: 4de97d6ba573719f03ae568096c0989f415ff0f592ae07a965ce412615efe8bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'create pdf of multiple jpg' suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=create+pdf+of+multiple+jpg PDF link annotation
    • http://syuncyoku.jp/upload/file/98131049719.pdfIn PDF document text
    • https://domilot.com/uploader/files/61569800598.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/rokodite.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6dfe915053dd14896f56de6e322476c/86693308962.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1628777929.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/66896047983.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/31038378551.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/21935557747.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18523538795.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/napum.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0sg7rk1et9a71vnqs95uuu8ujg/90011603209.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f909b9831---rafizezedefex.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107260846358860.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16095fea4921ac---652380511.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f4aaf1ed---nitamutomumifuvixojo.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/77546439326.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a280dd7b35d---60596945238.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5112010a---wegorekinekan.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gumip.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/5771281118.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/rivoxubawa.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/fudemezaxepom.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 19132 bytes
SHA-256: f1b7f59dc7a662cca30689b407b85b9503399ee87536ea6e3a26451adc1bd1c0
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 10828 bytes
SHA-256: a174637688f4e91ba00b857fc0a27c751026296302318e0204b7ae9d14f353ab

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