Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb906ce5a699614b…

MALICIOUS

PDF

109.2 KB Created: 2021-07-30 05:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 604ddd3ee8b6d9b7fcb3b8e5b3afda26 SHA-1: fa13c55e9b59f7b3044070abf066a1dbf59d5634 SHA-256: bb906ce5a699614b2e09274f4a29035583208c885997a3644d4d4258eb0899fa
204 Risk Score

Malware Insights

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

The PDF document contains a lure to install a browser extension or update, a common social-engineering tactic. It also hosts numerous links to PDFs on compromised or disposable domains, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://acpiindia.com/userfiles/file/17237436854.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a520e9c36c734f4eed2318a852e19310/bogokalizubosexu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/dilewovilijewomepij.pdfIn PDF document text
    • https://sbufficio.it/file/18944981987.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ed8c3bec---88600589799.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/63584648817.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/gutafakul.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/56880280666.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/tozirivojep.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0d77456338edc286a3e5da53fc61d4ad/linikozifaragos.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/5653fcacc9604168a3f54f80016ea9e6/28718436360.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7e7385a6b11a478f17a00d8eb7c990b7/1254362138.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9755be39b---41012730437.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/mufitomi.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/dulozufojazudaxaviw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ab5d4c23---jewex.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160700ec0852cf---lodekefi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f61d7b5c24d---bonado.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee49cc0328---zebiwejofavivemejo.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/korezovenunizuzudef.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/stkgkipbj3gs00ipg2b3chpeep/xozora.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcb09ecb0---54446192695.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/8ddmc9pho36h9cimv9slm6t33i/22427447960.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/mitadanuvuzil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+bypass+badoo+premiumPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016dcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16DCB 18924 bytes
SHA-256: 51b2c2d5bceb9151f5910a1b9158e15aef831a7ede48dced1d0fbfc7962ab4af
font_00_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 19620 bytes
SHA-256: 1f8a2c81d539240062047f045fa8c7287ae52a62a8d043dc189470b480ec302e
font_03_sfnt_off00018ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCC 10832 bytes
SHA-256: 23601223fb9bbc8e482a1a0048f82ac7bbc4d3e1a05155d49e5f4ae35f330ea6

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