Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5d302bc7a806f8…

MALICIOUS

PDF

86.5 KB Created: 2021-07-20 07:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1cd16e0ed2e1bcc5d9fd32a9cae1b3d8 SHA-1: 62eb0641ca4336224ba48b8201e847df5f1ee932 SHA-256: 2a5d302bc7a806f8793198b8360d237b8ef8bc2ab67fbba6c709a3295ccd64b9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rubyyadav.com/nbloom/fckuploads/file/57714265155.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1af7e2f7a34fcf6f20d46942e2bec668/28672460319.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/90043278311.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6e09fdca---97529827100.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086153299bdc---xomiwomojutijogi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f5360e5d4756f265e02390997dfd41e7/72729856228.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089af731b98d---milekofiderapuworoviline.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q8elak2qeakp9eanrdg7674325/reravij.pdfIn PDF document text
    • http://blatt-gruen.ch/files/rideme.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/sugorefedakexodafubog.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/92757680200.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/faruvugaxetugupebuwovaviv.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/85066357190.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/1282895838.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/28172949646.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e95ls6cecd1alr77j622f7c11/28284367800.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/zesugi.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/woligodutixadirepe.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/95017759342.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3987cbc10---namotoganupuwuxu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc23005ac5---xajonowula.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/votuxini.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d26e380ba---16004898178.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2da0000f0b30737f359f320fe051a4b9/63199200976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=i+wish+that+we+were+strong+enoughPDF 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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 17496 bytes
SHA-256: cf412ff200a324a58df273cb51d8cd3dd8b2d634d182da63b7284b0a8903cace
font_02_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 10476 bytes
SHA-256: ddab0b92f99d2e702f4582476b4cac052bc3ee2ce33788c4c4984757e704ce3b

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