Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b140d2fb83d7d93…

MALICIOUS

PDF

78.5 KB Created: 2021-07-07 06:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cb7003da07c96480ca9556810088583 SHA-1: 45b6045166e6ae4b596cabd4fe839c1be43b08cd SHA-256: 6b140d2fb83d7d9366803e0e822f24fcf2d67196b39ab996b249cf7fb2b5d250
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/a95p829tobhkuat0kbut8b59f3/zavibapozirebanuva.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b081898ad21d1861e20b9d2607cd3d94/mizera.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb912348a---17466270553.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/es75ks9vsnqnk7e7js4tcrho1l/finitezemuzogimos.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210624_194738.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zewakikofavakisivufebir.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f90fd4c5ec376e65508c0b21608dc209/ziwagudubekapukowisajak.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f09f538112---masut.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b8d44632---28233137032.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d50bc584e---xemetamuk.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6a60120eb4a8da4ab66bbb04363ab72d/vixuxuga.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc2eaa4bc---5644496464.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/povaferuwosapusepapu.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/dugosodek.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932922f3acf---41996441839.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528024413.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vofopagukuxupemurez.pdfIn PDF document text
    • http://emannsltd.com/userfiles/losikatigalikup.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/63720532864.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623126510.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786962e9a6f---lopirenonodabeperixikuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=highway+40+blues+chordsPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 17028 bytes
SHA-256: b1748b7b6b97d23cfd197dfeab222bdb0e9f0c31a5e7c869815d5f6928b2965b
font_02_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 11080 bytes
SHA-256: 0bb088aa6f0ef21b60e04e34baac27ac082609347c4bdc558801258974d8420f

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