Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c06697923646da…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 09:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b380b018ee39b39713ba2b3fe21f5fc8 SHA-1: d30f628513f841e6f3314932cb2a699a0788c41e SHA-256: a6c06697923646da22372db04fafbd13daca8b5462573a0cd9d6962936d32ddc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, as suggested by the 'link farm' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=characteristics+of+life+crossword+puzzle+pdf PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/616c1e46d3d0d528ef9e5123df6a8968/11475168724.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a2adb47f---39619965929.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jumixebafawosizeto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f94dd91e---xenumejebafofuwo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/30615894374.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/43907267789.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e7a2bb13c611a1d8a790aeb04b78e9fc/57625149966.pdfIn PDF document text
    • http://quinta.cl/upload/files/25163103375.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/jozapimigogadasumogeguged.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/xowijejekubuxotofi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/6skapbsnkuai8ans21vh0tap86/sinewukufitutibikokef.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/im183idqct8vcmgrv5cdnt7r17/delapuxomaf.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/59268386645.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0d88c3782a0997ea8851502446c67a63/bofelusejolava.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6debc6b8427f9e61ad996ce5abacd5ac/10861981080.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596b38938---85409926875.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/nizonivudepel.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/38211507439.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/buzesuwag.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/ligefijetarazeroxotesaxex.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f08475684ad---35527424557.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/5546287479.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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10888 bytes
SHA-256: ff91a8c9ad8c5cedf28c0da9a300a09374ca957f4af0e180da75b789f9d7816b
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 19368 bytes
SHA-256: 7b1a9b7973c775d5d9a3c5b0d20fcf5bb04f29ff1d52575504a494b415fd86a0

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