Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bae81c3cc1c91e7…

MALICIOUS

PDF

83.4 KB Created: 2021-07-17 12:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fee13e469260872dd6cb1650498ba2f6 SHA-1: aec233bd5f43537959300dffa2ec507e7a1266a0 SHA-256: 7bae81c3cc1c91e7a2c51f7cc972a63fcb3dd7803cde53c2daa22f5b134fb75f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fb49780e8eebceb4f9a7789117ab9d2/81295519008.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609096e60124e---pabexufare.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/93742796318.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5303c8940049166ce66ea96d728920a/sofebozebobapenozukufug.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/5817395573.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/c3qobp636lsgftlfn7k6f56tv7/buxisejagewad.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748d919b18c---voxixibapixeju.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/22026584261.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/simujudepotivalu.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3712362570.pdfIn PDF document text
    • http://splogservice.ru/content/file/626268968.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ad23158606173dd9b28e6d87d36ea075/vozixutabanogosulima.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/92086894692.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893d22bbdf---40522170083.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6fa0f26e---20232423985.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094745de7aba---96548538060.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/53778356588.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • https://telorgabus.com/contents//files/49906717412.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/076b1a3df7046ad0219f51e33cf84b96/xitalof.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/zokifibeliwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=6+gallons+equals+how+many+pintsPDF 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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 11116 bytes
SHA-256: b24479eae21599425c7896a8b22d058929c23135f89b4374d494885a2190686b
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 16424 bytes
SHA-256: d1d17869af3c2299d2aee7c6030d3fda024ee4ee1ae9ae0e0636226b18eba592
font_02_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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