Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5580b9b67600aa…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 22:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90487bb7a8ec5aa5d798c15871e39524 SHA-1: d84ac69e0becf926de647b4e8d05f807b32d9db2 SHA-256: 4d5580b9b67600aada51c0600f5828411b49ff7ac854f65b6340b8c4a820991f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=deathwatch+book+pdf PDF link annotation
    • http://redactron.com/userfiles/file/29135062388.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/29403680506.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/19295081521.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/gipubopatafozenudutujiba.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/56284271099.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/76621983301.pdfIn PDF document text
    • http://moneymaker-gold.de/files/jujotufisosefariferiru.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a89bb92a1---51279286756.pdfIn PDF document text
    • https://senegal4d.com/contents/files/35309802708.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb2abe3649---41553414813.pdfIn PDF document text
    • http://identik.hu/editor_up/gemetolotuxizopozufev.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e2jau1sksjj8bnlrl6qes1s92u/ziwir.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/87282145365.pdfIn PDF document text
    • https://tsegypt.com/file/famivavugiv.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/7092785064.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/fulekowomujuvuzakenu.pdfIn PDF document text
    • https://tckontrola.hr/files/29523382146.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327e708ac93---16400789045.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mesutoseramixinaruna.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xonodavidezavogulukubiki.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382ebdab2db---vibebovabo.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/zererijanubararofovuxop.pdfIn PDF document text
    • http://ledins.lv/cms/file/vumatediso.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/bariburovazomawerodagozim.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/32993923476.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xelosudijidoporafet.pdfIn 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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 18892 bytes
SHA-256: 96f61a43783790c32b08093eb73b748b5408039da943ac13d3e77d681df0adc3
font_01_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 10524 bytes
SHA-256: bde2f340d1dcda9374961762e0f812fbe680f51caf1250ead27520a8ff57ce32

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