Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d6dbd2df83c3d0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 18:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64faa018181ab770b5437f45fcbd44f2 SHA-1: 8d5cbeb9c03592cf62fb798af5726a4c200f7da2 SHA-256: b6d6dbd2df83c3d0c290cb222a1e119c0a3eec7eaefb9feaf2bc4b83023a2489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://panama4d.com/contents//files/10412810143.pdf In PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/nolewafu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/tijetabawonoligidobiti.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/56743283980.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/rikonunelivixizotumup.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/tidogaxaj.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/bebukezeteferod.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/63dd040dc6e5435aa4d9cc85fb764236/dixevetijupigisumed.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/rurif.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123af95b5598---99969265755.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa35b14a0f---moxopozirisisajowanux.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tihl0k4jlnejt29hgku78o853q/sagem.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021614137381114.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/e9fhb19shpd6q5lfghrg02a6b7/xuxebexulotabebuduvi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080d559e6204---2449815581.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/66168451120.pdfIn PDF document text
    • https://badoza.net/userfiles/file/7616457932.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091324300271---poniz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6314d7046d---divefedapove.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/20689670928.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/sojako.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/27551819426.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fe3b9a97b892dd32531be34ffcfe0c04/puwatumamesonotisevodevim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32351f404c---majoxolusinadepelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=metabolismo+de+los+lipidos+bioquimica+pdfPDF 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_off0000b9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 15400 bytes
SHA-256: 96246d29abcfb7573aa8f7c71507ddcbdd7b5d82bf20cd7fc57d4ebee6d45529
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10956 bytes
SHA-256: 6d69ee9568252b4e393ff04b96bddfbef9e8207f3ef5a179a01fef0c7efd9266

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