Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ed44b12f80f577…

MALICIOUS

PDF

96.0 KB Created: 2021-08-19 14:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e85e254526c4692ad88bd36f4c7f1e26 SHA-1: 20527e0d6b68a25736f82107bc16c95618692d60 SHA-256: 99ed44b12f80f577656dbbee7efe6c6b89a444c65a757c5239568d0212d794ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL distribution align with techniques used to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://hy-concrete.ru/d/files/mukekidixusulupuvinadi.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/om2a5rhd3lnlf5rg05pc0svd3j/vosinazobo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb720d8cf63---34203360471.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/18238850167.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vizukagataf.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16110b7ac5e9fe---27210933131.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/24548854352.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210806104258.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///5559747014.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/80249740673.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/60513322953.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eeb63f2962fa5a26dce3435bc73b9563/wikedibogatewuligatopusos.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/pibazawilupazowopimotit.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/smsbb74os21p0e9nmqi1jmv6jr/50285018075.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/91890516213.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980d553014---74692256169.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/nogetupudulebixiragubi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9d23a0357cdce4d6a1b5cff0ab853868/jadijanaximafagame.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2j17m8hehrd1ei8d5hq0vqumf0/wasijix.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/83686717512.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/nasibopiwijufavemutuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=are+floto+bags+goodPDF 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_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 10456 bytes
SHA-256: 1fcb3fca8eec9913e656ff9cbff7496b8286e6bb8af10a3816b6bc30265cec8f
font_01_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 17852 bytes
SHA-256: 0910586a9692aa8d75ca928334ca5a40545b5ff40b301b7c9d08195aea7d83b8
font_02_sfnt_off0001589c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1