Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf80f54b89d3ce9c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 11:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92b2053074ebe9a736bdaf5507e847c4 SHA-1: 3921305f578fe8cb2b4416870b190d8e93985300 SHA-256: bf80f54b89d3ce9cc7ba04f2cb11ca156993aa5906e369f6b25a8fe8a0468eb5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=the+mean+value+theorem+for+integrals+homework PDF link annotation
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/42f73520988ce92e6859150d64e896d9/2844595609.pdfIn PDF document text
    • https://ntc-container.com/upload/files/piriridunozonudib.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/tudegad.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8fm3keg36fptsmuvh94ihue6s6/mijubozufanapigiwolewi.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/larezogukemed.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106161314439544.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e9cf906254959105ca0809d63894c849/31068403572.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/rimobivotirikigik.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/bowefog.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f2lhm07cquabkeqhonica80lu1/45512643367.pdfIn PDF document text
    • http://dztechfin.com/upload/file///59602403791.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/jomorifel.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/q9tp43pqafkbb7lvcrun8shc74/tiwovowilufogowiw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ccd2fd4a8fabc506df0cc35c86747732/kixefizezaralumurow.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/jerajinubi.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pawomupetimafapenomu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/26m9srtsc8b1e3c2igsdnlmdp5/25747400333.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210511025606_1354524459.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607208f1e631a---tejiwazimuvofodige.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/rifuzagi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a296a0f0---3674191271.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/91e4abaefe0cc17a0fcb296f1f6dc26b/79973962372.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/83021260151.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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 10968 bytes
SHA-256: 4749f8a4a30d4620ac468bde69b0bb67bcf78f22b68d3e8129fe5acbeae7e996
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 18220 bytes
SHA-256: 532cbf14f9755acbead4223ef787c90070e1f834630427639414b4fee2913961

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