Malicious PDF — malware analysis report

Static analysis result for SHA-256 6678d3a213d8d374…

MALICIOUS

PDF

92.1 KB Created: 2021-08-03 06:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd9fc57b1c98d501c624921851de6faa SHA-1: b7e497e079b6c214247cbf93a19476163b91a87b SHA-256: 6678d3a213d8d374214ddde7154cc46bc3293332f0c05153ea06f1d4ec0f39e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content, likely phishing pages or malware downloads. The PDF's structure and the nature of the URLs indicate a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=gta+4+apk+obb+90mb PDF link annotation
    • https://majorsagilekvaros.hu/uploads/file/kolibidud.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/67508757567.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rutogadopafi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/42587297603.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qa6hove2ervv5e4bp2jb03uue5/30483716708.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e03e236a5d211f97fc1fa575bc918a15/12331807510.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b43cb2485---28280916073.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160804478b9019---tutedavejawos.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/75182187188.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/fitagijujoroxokezun.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db2cb6b99---30677121817.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ce190m7s8e9eaud0244ml8hn57/82610153766.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/84061288160d3cfcdce9d1.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6124b81de1---28853340577.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/66206430437.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/36245764226.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bojojosenem.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57c5ecd0b---nogetegufukejajezinalif.pdfIn PDF document text
    • http://centronegozi.com/public/razuzafivewatedufagix.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad340cdc8ce---56924506882.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhqfjgts9u4jnchouiu86a5jd7/92218074924.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/318a3c67716e0de2dbad123688c3cbd1/kisepewixuxabadix.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091b1f391dc4---lexuronudezig.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/188aded1fdc905c4ab2e62998cd09c4c/lojowozimev.pdfIn PDF document text
    • http://esistore.be/userfiles/file/47704574190.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_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 17112 bytes
SHA-256: 834ff59db2970764474600d9f0a915ceb0e4f7143c31fa72190eaf3a035f44c1
font_02_sfnt_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 10408 bytes
SHA-256: f1de8150695a1c6a4c5f7581db9f93069f5c7712ec83065951dbfb2abc24e25d

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