Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71299d719e36ca4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 20:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2536ad3946d431ed4075e79e3c67d9b1 SHA-1: 34e4358a9f3d1c71c06b5a3337c4c29c589ec18a SHA-256: b71299d719e36ca4d8912ac29fe9a32977dbd8fc769ca59ee5478a3823e658f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns pointing to compromised websites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=english+file+b1+teacher%27s+book+pdf PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8226fa9e---jixuzaroxirubo.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/77916893940.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///rikerezolidivabutofigofo.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/31309856585.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/95770574850.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7a5a5c598---sifedatomibuvexutiw.pdfIn PDF document text
    • https://linker.tw/files/17747742463.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/gujafeligipudutowarewosa.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cb368461---mujasozogidiwotoxosuju.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bevobasevuwafafojakegade.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/73045532214.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/33769426585.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/zosinena.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/jafegukak.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/52734184782.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/95593965334.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccfa721e10---gubaganimo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c462d7835ad3e13011f208ff60800197/32891795802.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/gizokuwuvijusus.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/gatabuf.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/90497756928.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/lowodovubon.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2b1a218a2---wudawoxedolazeremafe.pdfIn PDF document text
    • http://jump360.co/upload/files/20210904070254.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_off0000b361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 15528 bytes
SHA-256: 985b3e6df51ecbe0c5461184b2a0b943d89079fc83ea74a3b65d765755a9c401
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 11200 bytes
SHA-256: 49a5dd6a900a4f9df56390eb27f949a324e504b82db161a1deea6803bd3d4bcf
font_02_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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