Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8daef58e97ca2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 18:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02c5d39939aa11a13742b8df578dd27e SHA-1: 3731cdb14dfade591785fc3b09455430918f98be SHA-256: b4b8daef58e97ca2db2b5f978981bfdf4308a632869cc54ce08eaba214e79654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to numerous websites, many of which are hosted on compromised or disposable domains. The embedded URLs suggest a phishing or scamming attempt, likely aiming to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=sql+alter+table+add+default PDF link annotation
    • http://haumeaonline.com/userfiles/file/gajisuwamak.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/96408904257.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210730_422D326AF1560FA7.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/96b1886d37ce3ba2ef00f73d5c0e7a40/pamikoxa.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/64908636061.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/65240750430.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611990a487e01---27626414191.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11558098247.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/b99jp4drg90cena7inqm2mogl4/gelibesefotawonozaji.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/868b351a3a0146b0ddab3791e80ce100/62804738307.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160988d949b6d6---7749844711.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/33861159939.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/35041208044.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/fidugoxexisefelanot.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53dbe64774---pimodupotokafewutudosowu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cda9e562b---tipefix.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jadegogu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/zovibiwewasozedi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/desexepovote.pdfIn PDF document text
    • https://buka.ru/sadm_files/pebamitevoje.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/v4msgfaapfrik3bhrep0ved7kv/83562706286.pdfIn PDF document text
    • http://tms-operation.com/upload/files/rapewibaxi.pdfIn PDF document text
    • http://amdind.com/userfiles/file/50567928032.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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 17048 bytes
SHA-256: 658a13dec018f6572e8ddf7035b45f9c045fe0a769cc893e7b0fba126d696900
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10324 bytes
SHA-256: d58b214dfcd04ba8e0bd9ffec842bf314cfdfb8726fa17754a6ca04edb8db764

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