Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe1506d408dde0b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 07:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c093a4a9aea690b56c5c1af121cbd371 SHA-1: cc63add96ca35a0c779eac71a409a6ad69257def SHA-256: bfe1506d408dde0b04523c6d2d6cd92beadccfbcae059ac5385dff8386611dc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish users. The embedded JavaScript is likely responsible for executing the malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f45bbd1e3---69600155500.pdf In PDF document text
    • http://jevades.com/aircraft/fckimages/file/rogefubiwasurikixu.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/55106890020.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac050bcc12b---63796350850.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a1or8dvd3ji33iro9i3kpcer22/debiwanax.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b69b54f485e68c7b44826ab3d26c753f/bexivisusijedufogexipof.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce235b19a5---73380923748.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b4j38qml5i81k2b3c16nhukts/24982603059.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210612144805.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/33736254994.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/50375008396.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kibetorixefapulozos.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/lilosodozapuwiko.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24860590381.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/regamibudebevufebapoxeg.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/99284a155c1f45ac6b1cd27671dcb132/nemukefivo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/20628210702.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/guwegi.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/7106831612.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/badepa.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/widilelupozirivakumok.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/wojukenumi.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5e5f569eb6e12321e7628adfb381d392/misusiboviworigel.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/80359310162.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/donolabeba.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/nuxerigirevejumitakibewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=engel+fridge+freezer+40+litre+manualPDF 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_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10752 bytes
SHA-256: b7a39b8e8c2b34160e713ac9b2013f6c7f0421b189b01e356db774b249085310
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 18336 bytes
SHA-256: f2d29d8f0083226d48659570ef09fcceef7a868541897ba44032f96741c16365

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