Malicious PDF — malware analysis report

Static analysis result for SHA-256 e076d638d1b0b1b1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85785875255cf4d267b2e5ef7b658a80 SHA-1: 997cbaa320765e270c56514b4057cb39938c9635 SHA-256: e076d638d1b0b1b1cf3c491d299b5162033514d8976c7d7e4592541eb50added
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, acting as a link farm. The ML classifier strongly indicates maliciousness, and the presence of embedded links suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL findings point to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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://hoangphatdanang.com/uploads/image/files/toduseturamawigibo.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3477a876b---66853683042.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/walukulipuleg.pdfIn PDF document text
    • http://msiutilities.biz/documents/kifoveleso.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/14658079041.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904194520.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130670944125---90241781785.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/73430631439.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/79252652435.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/tuwid.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/23524921664.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/golizipuvikewukip.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133fceda3cb3---17804510220.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/ferebefigaxix.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kifogilejapesekivebal.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/82833958485.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xupunovekukuviratawawifov.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/4buiqglnas6iriu0cucspmjfmf/lojetamigaxilo.pdfIn PDF document text
    • http://boldogelet.hu/media/makasaku.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/90920967345.pdfIn PDF document text
    • http://renknh.com/ckupload/files/30010615940.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1863583d---vanalanufejemugok.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f980de2474ee788d6f241d11cbb44f02/datuguzifunurijozikopa.pdfIn PDF document text
    • http://ned.ru/uploads/files/munumup.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/23571296457.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/28712051085.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/sasoripejef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+battle+of+polytopia+mod+apkPDF 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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16480 bytes
SHA-256: f00d5c309acea18a02c50b8d0bed96afe6f380545efe11d430c352923f0d2b6d
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 10700 bytes
SHA-256: c3b0edfa4eff44e8fa4c5872cf555521a76bdc2517ffee2c00b1c09d0485f341
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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