Malicious PDF — malware analysis report

Static analysis result for SHA-256 75eb3e2ac9797d4d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 23:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da20c427ef934d602a8ce0c302eb982c SHA-1: 8ef291a27a70fe78cef19d610885cd6f37c2ad34 SHA-256: 75eb3e2ac9797d4d9a0ced12eb5cde9878832815b9fc0f5ffdb7a159f2ab630e
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and links to external URLs, some of which are hosted on compromised WordPress sites. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, aiming to trick the user into interacting with the malicious links. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://synerhu.ru/uplcv?utm_term=ingenico+card+machine+manual+ict250 PDF link annotation
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a894291b35---90717903983.pdfIn PDF document text
    • http://metall-press.ru/files/7049627550.pdfIn PDF document text
    • https://unosms.us/userfiles/file/ratomapupadojini.pdfIn PDF document text
    • https://sealskinz.ru/files/file/18199702564.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/muwexejezifelaf.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28520488912.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8de7719ede---fajomuz.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090486fb1d64---tomirogifoxuvoketupazelig.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aebe4aada---kupedanozebijiwiti.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/gabojetonix.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/67744453602.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kuterutolagofut.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gf6rvqpi0nnnu7kb4jdalchfg4/deguwojivogefigag.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/surakowiv.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/bojitiba.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a816611fb60---16295889697.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/49204257308.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f08df970439e119f3150eae1515d71f1/bekek.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/55095104014.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0tufnat90fmlp065dng8fov5e2/pixofoz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/51121361315.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196ed2897fc---xikokafejune.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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 15272 bytes
SHA-256: e2a736bb2b21fb3a56cdf2cdc462414ce62c5505652abf3d2e9b7eb98d874b2e
font_02_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 11076 bytes
SHA-256: ffc8296d99fc41b518cf55fbe52b777d212ff27987f1b28cb7aef43fd5f10870

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