Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7e52b5954691b7…

MALICIOUS

PDF

99.0 KB Created: 2021-09-14 05:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ecbf7a22bfaf58288384378ec7476d5 SHA-1: c3fb5cd386de13694c78f56dd628cc3da48be41b SHA-256: 3a7e52b5954691b78d1b70adbe740f41bd9a398d29d49d8719990fd8c87b9f7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=watch+venom+putlocker PDF link annotation
    • http://neoclassicalmansions.com/uplds/file/jitasaderuxuwudusofu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/54082975325.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/52681617337.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/81540333231.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/19128518773.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1cb9ecb2---4961197378.pdfIn PDF document text
    • http://kmsenior.org/file/files/40826809699.pdfIn PDF document text
    • http://turatabor.hu/media/71160212977.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/33470610950.pdfIn PDF document text
    • http://mutitar.com/user_img/files/mudivegowatubeketijusut.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/vesitetofonasedowonit.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tetofovamisekokujudetomo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f859d7e833---88273332299.pdfIn PDF document text
    • https://penzion-palice.cz/content/34408395999.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2963633629.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/soziv.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wavekotov.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/selivukefakafeb.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lazevuzoguvom.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/vamelo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lunimupetenuxipelev.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/mimodivunilidiro.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8232148b9b55450f8e2472c630dfacac/finekufodubuwifese.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/38424153817.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/jataxazanalolug.pdfIn PDF document text
    • http://justnewtoday.com/movie/550988/venom-2.htmlIn PDF document text
    • 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_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 10628 bytes
SHA-256: 5817191546a6b4d260ae3c600883b672805764a2f89043fe7212f1b67bb8bbf5
font_01_sfnt_off0001327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 19256 bytes
SHA-256: 2ac034ab7e405130aac9f9383d5423caaca5848553d37a0b4898ce0438a65e5a
font_02_sfnt_off00016532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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