Malicious PDF — malware analysis report

Static analysis result for SHA-256 b882eac0849d99e1…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 12:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bbafe075b64019a55134597393b5decd SHA-1: d493b783c7ac036f862a8c1cda00b3b01300a000 SHA-256: b882eac0849d99e12cce3f36232f4a414d9ffe2554662330a7ac8fc22e85ddc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=english+class+10+pdf+ncert PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160905e82bb15b---jorogenakapuk.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/5b6n54oa9kanc88si2dnmhqtro/woboju.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8eee5cd8---wizofajubuv.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/35651785394.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a029e1021---nolutapubenexofibijow.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/56728903877.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e5951e0fcdf---paporalak.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/28480692072.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/88671812171.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/zulugogenupiwa.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/89804095409.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/312cd837b235802278634c2b0d246a91/5383555615.pdfIn PDF document text
    • http://ellev.fr/upload/files/dowusavesimox.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/40ac97c2651cd5afbe30a7077738f6bb/veduxomokiwadijiju.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/zetumabenunudoliduzojor.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/xiwutini.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/efb5b9f1af6be6171f3a09739435ee42/30870184840.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/dopulizit.pdfIn PDF document text
    • http://chemicalengineers.ie/images/71298807254.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c018e58b45e9218a6f16e64ecf695c88/22924941593.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f88b4920069f366929ca349060bcba53/73046902901.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/alo97rv4eu1lo9turu0i5rk4m0/xuwunajabopituj.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_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 19140 bytes
SHA-256: ac6229d62c6fe69efeddb2a346fd90f64711942f772cfbcf3f018dcc81b78bc1
font_01_sfnt_off00013e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15634 10936 bytes
SHA-256: 45211ec5a69102f2492f4fe6abc32d202fd85025871751ada50f898facc2f193

Open this report in the interactive analyzer, or submit your own file for analysis.