Malicious PDF — malware analysis report

Static analysis result for SHA-256 890cac0ee7bb34a8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 01:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1e33b02706e79eea75f70d3ce6e768d SHA-1: b4ede93457469936fffe37361abbb92a57795ed9 SHA-256: 890cac0ee7bb34a85731246d924584ab24b62a9deeac597e65e217ae38476fcf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates an attempt to lead users to external, potentially harmful, sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lnprnp2fklboje3dtl50cpvh5q/kidizirabepos.pdf In PDF document text
    • https://sealskinz.ru/files/file/fojetanirumufotakavaw.pdfIn PDF document text
    • https://schmitz.cz/res/file/10936007889.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/66217326458.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/parinotef.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/49605597308.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/navurebasadamuvikubikas.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/89844642010.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/vokojasipugusakitujanolu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210901065336.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tifof.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4898854faa0ee12bcf101e21e907bf19/nerevakesetever.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/59ujfo5pfgd2hor40kcdrdaah7/6782403278.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/6397711741.pdfIn PDF document text
    • https://unosms.us/userfiles/file/folutobinidovakirubixed.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/41118755869.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/gufibajijob.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/davanizinozak.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/femibijanabusa.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/60073858515.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5824c613---wurafulonekozafanurira.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/wasufojapivigen.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/wexivosiwazogakepo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe4fb516f---wazunukuxamoloxajiwus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=listen+beyonce+piano+pdfPDF 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_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 17308 bytes
SHA-256: b2dd05730c4c64cf23908aea62b7f253d112d22b1406d020717568fb91fe509c
font_02_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 10680 bytes
SHA-256: 0be190ec2f3097cc2c15ac4c744ef519239737e5320129cb8e619efe8f02bee6

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