Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8d127e787501c7…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 21:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 543fbdc612c538dffbc63761b8a7b28b SHA-1: c3b3bdc6534118e1188597d48be2143914d88b51 SHA-256: 1b8d127e787501c716c4f46c60a4e66c20d65f1dd3b7e4c9efa185b0f85b06a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to potentially compromised websites, suggesting a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, and the presence of 'fake indian debit card generator' in a URL further supports a phishing lure. Although no scripts were directly extracted, the nature of the links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://autoset66.ru/admin/ckfinder/userfiles/files/9888705162.pdf In PDF document text
    • http://jump360.co/upload/files/20210913233001.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161345b4a84ea8---83351082359.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/fixetakivuremoduvaropara.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/68375537381.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/87660555440.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/432e56a0c4ad8fe3c00f0fbf883fdbe6/lekirunuguropoxavunovitej.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161392131f20fb---nunefetiduv.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/lakugiziniparaxopan.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vmbuuqg9mtpduhvmopalscccck/69404251908.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/86575193163.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/zexeluw.pdfIn PDF document text
    • http://portableandcool.com/files/files/38878063843.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/81604456961.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/mexijegipugawenejub.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/90347203255.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/86288031426.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/rivibifur.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/mixagijuwumekefoxofotusu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vosilo.pdfIn PDF document text
    • https://parc-hotel.info/file/wewevikubisasudodoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fake+indian+debit+card+generatorPDF 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_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 10540 bytes
SHA-256: 5c8aac4291cb4d9f58a700917a72d701a4fee6bda8a91b06efb0fbc4754ff1c9
font_01_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C7 17844 bytes
SHA-256: e0285bd7cc528e6deddb83132dbf0201f2602208a247aa440cd1dbf6bfa56e4f