Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88012350e341722…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 15:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5db14d51a6223c1fb34d37be32c1083 SHA-1: f4c183d9c9574318ae3bf6ccdb0f2700beff22c6 SHA-256: c88012350e3417220b4c55c2cf83f8eb3033938f9f25ab18865a92f988bef6ad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The presence of a 'password-protected archive lure' heuristic strongly suggests the document is designed to trick users into downloading and decrypting a malicious payload, likely to bypass security filters. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a broad distribution effort. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=teaching+shapes+to+preschoolers+worksheets PDF link annotation
    • http://rrbrentacars.com/files/others/watewakag.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96365243679.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e8122464c3322c6c0a8e222b47b3b3f4/8968405932.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8292498154.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4ca36728f20be3839a521114bd0ea065/91601877269.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210801/file/16278042817559.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/fexexeru.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/xarezatamovegubezivo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071466e29bd3---jixiporeziguvorejuretebe.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/45135700766.pdfIn PDF document text
    • http://chemicalengineers.ie/images/xijamejevojepa.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/9091002302.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/00b19de0ed6f9f6cd79f99f6d120d0c8/xejizas.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xirilesat.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/detesipegupuvamezojaxebul.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gavapofugomabop.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/latufabunanoxalenuborix.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/lebowogixufamito.pdfIn PDF document text
    • http://bjjiffy.com/upload/moxiwoturiwolas.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4ebde9be---30657322423.pdfIn PDF document text
    • https://congchung7.com/upload/file/15043579699.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/19186338335.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/56557480535.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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10796 bytes
SHA-256: 95a1648a928913e58ec80c44850c360685caf6badd9387afb9a13c61a6b612cb
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 17652 bytes
SHA-256: 6af705af42c97dfbd05f3ec398be835698e49181b5008d76c88714d0c41ed861

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