Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cbf80159cf7c66…

MALICIOUS

PDF

103.6 KB Created: 2021-07-25 09:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42a5ede704c78596a3e3d5be93ab2275 SHA-1: 358b8ed70cbd78945cd9d6ef0ab8a0ecef2d054c SHA-256: f4cbf80159cf7c66064b7fc2ddd042f753c3052d942fe8f63a364282ef1e6407
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. While no scripts were directly extracted, the presence of external links and the ML classification suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://brkvinc.com/userfiles/file/63710118402.pdf In PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/33609243884.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/pagesaxomuzafe.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/47074635209.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/67056918864.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bac10eb0d5370f7201a5aee3523507c9/wopijurepurodazezi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/42949669835.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/91446884909.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/bewepop.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bd63fd6f6e9e143c3a872634bb409b72/31966802762.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160711f44ea236---gupeleximupaxu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec59aebb9---69170026004.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c19757605---bewoninunuxu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/46ea7998e026f79e8919bea4814e6748/98208906941.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/14327598119153752d305fde127f336b/46088245821.pdfIn PDF document text
    • https://mihalex.by/files/files/tuvufufozo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6159d3a4d---janoruvuduturoworudivi.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/75476366119.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fa502d1f99135e1dc66c363fee75c24/muvaxoneb.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06164aff7---90695099414.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/74871211838.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/57528185585.pdfIn PDF document text
    • https://hoavily.com/uploads/files/xobesose.pdfIn PDF document text
    • http://dalaichau.com/files/30782481282.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937195f604---66768104771.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/efa4cd1db2775dfc6cda40584c377d16/56225163466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+change+your+screen+time+passcodePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 17912 bytes
SHA-256: 8e301fd9b6ecf2448cdfd82957891c7ac44ea4543267c036ae94cd6f60b491f4
font_01_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 11208 bytes
SHA-256: dea0f320d19218234c7ef06b484fe52f3aad973ad07ec8227354f0d929c7b6fa
font_02_sfnt_off00015f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000177af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177AF 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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