Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd041d0debcd3e4f…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 19:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0787dc18762d4ae2d70c88367f38bf37 SHA-1: 34e6a4225c9c1a680c0194010147277d6c081dc0 SHA-256: bd041d0debcd3e4fbbc7be8da15651e76e446b92616fdf74325f005b155e6f1f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://slbreakingnews.com/ckfinder/userfiles/files/tedin.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2b421b97c5936ea5ec4a8c0b8e485ace/99912721323.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/o7ndiiamp3nto1prei4aedb030/petud.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cebf23f35c3---tidekupunanamumejukave.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/rubediwadokekemekuxop.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dnhaq3ek5b2lqa3j2piap1vadd/rufoguzadanoxa.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/30907227454.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/rojelefupekojikulej.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f88436a23f517a3ebab58db50b2dd637/50396142590.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/82982ea2841ac52b9eb149432b59f0d6/dobiwolamoxewesivimorukek.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/jasupebasaruto.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/121uvt6g7oc30jajco1r0u7n2n/lajewokifaso.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960739d840---55216583074.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8f7b9105304357d349f25821f4f67efe/4430137259.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0t6pbtorf4beqenaq599k5p62u/jenesosug.pdfIn PDF document text
    • http://silmalogistics.com/sitename/app/webroot/uploads/ckuploads/files/fetewuve.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160805e7351a23---dodulasunifakabezoperixe.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gcc5o4a7182u6nt22a3sd9pmfk/49231073616.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/50c7mugu1226g69rbr4fb8t2k5/2468987124.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/829bed454c40f2b8b9bccb88b83931d0/86623698076.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/da1d01501ce43f79e5231315cfd65380/dumesavetarojupelukuxor.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pevane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=issues+with+critical+race+theoryPDF link annotation
    • http://medlab.webd.pl/upload/file/pewirexejas.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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16628 bytes
SHA-256: 3dbfa1aab10aca8dd7e1bb589914a173003f948794b8ae9f736fabd54b4397d8
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 10476 bytes
SHA-256: 1eeb3f843386add2c7daf45c53ff706fb0e7f3e0e0d657a308fd8ee376142616
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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