Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bbf879b9eb3d04…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 07:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96843a7f7540511bdadba4356652c852 SHA-1: bcdc9bba1aa0a4db360fc5ae528f9c56295fde7c SHA-256: 86bbf879b9eb3d040dbce7e7fa2bcbf8f47fbfa54be10912047cdf9be5b1f045
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. ClamAV identified the file as a phishing trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://terfigyelokamera.info/files/file/bomipavefavopetusorex.pdf In PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/nopipigivuten.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rgdkl2vrhs0um9k8b02347gc26/36073331273.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/99395020096.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/061041331037.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/todirix.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210918/files/20210918080208.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/83148556538.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogediwilajawo.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/38120184008.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/lasonabilotadovek.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/48277393787.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rt3t9qa6l7doglrnm0mqbhl9r3/fizibozaxutumunegajozemu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3875c636---jejagamomapinanaj.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/13219537466.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/fakifojafezenitubupawoxez.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/rarunewosova.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/89657856629.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/99515302479.pdfIn PDF document text
    • http://contextuae.com/resimler/files/64369475329.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6387156627392d1ec75d065629f43fd/12579516532.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/1760233047.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/65667942893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+live+tv+app+for+androidPDF 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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 17464 bytes
SHA-256: 6ac1a03ba1bab59a6093eab63cde9c08675aa43e70cf73df7f0c56e187c90b77
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 10504 bytes
SHA-256: 85a8ccbd39bf12f559a3ab29a747c74e6b1ecf0da6d7bb2589968fc81944eccc

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