Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d518aa3a7112039…

MALICIOUS

PDF

147.4 KB Created: 2021-09-05 02:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8ca8f0cbc1b4b71dc35aadce314eafbe SHA-1: 6cda081802001dd44c04d2603c57444ac49637d9 SHA-256: 2d518aa3a7112039f317cc6664f388396ebadc884b76c4a6274e1381a69210a7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful 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.
  • 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 http://www.peretprod.ro/content-images/file/9162904787.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/52881450184.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5651dabe---wirakowiripug.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/faf1980ef0cabd1de524dd5f80dd8257/javagem.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358083b759---tizikenelegiturulufakimu.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/mevakipozugijafowex.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/suvemudomagowi.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/welalezodugobo.pdfIn PDF document text
    • http://888chji.com/userfiles/files/xunegaxixibamus.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/vinatasobubonod.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef684de45---bobuzodigewekefov.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd9230897---funikezaxebevawobuw.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/rakigikukawedazi.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/xokexafozekabapuk.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/bifujogunigivibigaxe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kovozebajukitijo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fewamav.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/l58gf15rp47l6qc54u8vipnor7/20876073651.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/nenifugudobil.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8961c1af64aa547e0b190baf81c4726b/49510833769.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/xobixebufimiwagisa.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/kigajaf.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/9382168028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=western+digital+my+cloud+ex2+ultra+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_off0001db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F35B 19104 bytes
SHA-256: 38764cf580f60d8487a0eb54e89674b7079a79f821c6d942e5c0f418f99d8af1
font_02_sfnt_off0002259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2259B 11144 bytes
SHA-256: 364b9f0e25a597c1ed1761585565a96971a3d1c6623452675b42625dd943dc57

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