Malicious PDF — malware analysis report

Static analysis result for SHA-256 61baddcf65f436a6…

MALICIOUS

PDF

92.3 KB Created: 2021-07-18 17:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b90cbddcd6df8466b391c78bebe1993f SHA-1: 54ad3f781600fba5b594704b5b3a72f8cd442749 SHA-256: 61baddcf65f436a60ec1a349eddd20293721ad3a755e5dc797cd0e3e10fbdd1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a5ed4bfc2401bd5aabfe5311f9909686/galotorozokiv.pdf In PDF document text
    • https://mfdesign.hu/files/file/jewobuzogudupokow.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/79971926734.pdfIn PDF document text
    • https://topupdana.com/contents//files/77407639192.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/wizukukepolegofekixol.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/bikijalit.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/25b2e8d65a5fd8ca302eb8b93a5a7ba2/ravure.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/faxizoki.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/luvesinatimezinepekekuv.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7084db6f---bidipabibewunomagowutinar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845967429f---46248313833.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/90134023113.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jukogosazi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3111d713cbca097aa411b26b2ed722c7/fiwamubifexi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76da1eea19---42641034953.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd76cffc4---nemiralifawisada.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2200bc3f8b---32188794738.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7847c1c2---jimurofoludixamafot.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083537dae332---setolajipifumakapekenigaf.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec3f4ec8c---numasenototuduwamul.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/rejorivuxigigewevaki.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sigid.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/83563092618.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96f2d2940---ruvajonolofexaluko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=weight+of+loaded+concrete+truckPDF 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_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10772 bytes
SHA-256: 12eaaab1472208eff5b3bb6249d9e295af02dfc275c3ee0181074da4f7f5be4b
font_01_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 17500 bytes
SHA-256: ec345a2060714fcc6188473157b51a396635999f0f4d557c5ada7705a63e80e2