Malicious PDF — malware analysis report

Static analysis result for SHA-256 7228c3b832b28269…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 23:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b46febac45b738ea8b15536f0bbf6383 SHA-1: e525a9e7331785985a319450b763958a12784b2a SHA-256: 7228c3b832b28269f770fa7bfa02c9316ec4112bb28ef0344e7f78bcc9f499cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 https://debcopharma.com/userfiles/file/bewugaxovadinexim.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8015631c7---82105183654.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8711c4a04---bopuzanakefefoju.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/575e47b119cf5f8a0e447d6e71374b67/fariwuxam.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8b051e7c---pazopipelajaravev.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4ruia3dpa8g9r9538hvb8fsbh1/gunoboxukamuxozapefoza.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bj9s67721fd5plnt78sbq62h6l/18739181049.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dtu3ctuu2resmeouvmcjcgfrf6/48786976012.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/67361902248.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/22b313fadb2b05a09e72c88527d5b6ed/17072482204.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/196f798eb78a26ceb9c117904fef7831/64532205000.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849c10da24---vogupesaniwozi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7b82e0ee174230d8d17922621b172c66/lusopawatekelokawag.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dafff0d00dd45f3a29a34192c5dfc586/nojifis.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4167981efb---90187803045.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/93806511400.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/19197696500.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vi7ss1tche4ba87aukkot2cpuf/lipomigerukiwunubafaxego.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a59cc6fa---87861997977.pdfIn PDF document text
    • http://szwygs.com/upload/pibote.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61862e37e---ribodidap.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/nozifevanefagigovusazogin.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c5931a94---kewetusalupiditozizonipoj.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/76227741111.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/derodizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=another+word+for+sense+of+humorPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 21956 bytes
SHA-256: c394ee4fb905067e41ac1d6b68db4e76b9ca618e70a3d3c077861c5956e21dc0
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 17680 bytes
SHA-256: 30c23f71e01acf968b308ac347c05d1300255de662c7ab6427fbc18e8e561f6d
font_02_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 3272 bytes
SHA-256: f7b4b55928b16e7e523ccdc55b53d877f0bf37319ea6e4402a94e0184ac37a1b
font_03_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 10484 bytes
SHA-256: 5ccc99bd1ccf740fbd9d3309ba7d7a3372f0b93476607b43ea6935a28ebc112c
font_04_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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