Malicious PDF — malware analysis report

Static analysis result for SHA-256 66025e21e106d476…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 11:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d534959b5cac9f3106485dbcce773e6 SHA-1: 06df999d9062244f35ed9f9239a733a6d45c0bb6 SHA-256: 66025e21e106d4769a4a63e1e0f3ef830c6c8d3315b9a9340b94dcdf59565ec7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dfwsedan.com/nbloom/fckuploads/file/87477727632.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/90224397195.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05cf7c88a---38564388539.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/refivewovupejoparozobenag.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/mexosagot.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/95802282061.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517004756878975.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a6c52c88---zuredaj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d4da46f47b7399976bdafcb7c8230df/jorede.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/zamilut.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lrsrionh3enidsjc5sh37690e0/gukedabapokig.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/47114720734.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/dumejijanipum.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/129734257960cbaf6249f6e.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63a6667ae---68697983287.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d56b600706a---birijesam.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/86386375309.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0c3e2fa0ec982fdf41ab88bce28f4191/32910974312.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210531_800264E1CF7D3845.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afd6d5911fecdd85ea5168bb2222743e/fifidakobitivumesulifut.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vazutidi.pdfIn PDF document text
    • http://keramann.ru/uploads/files/ropirejeximawofo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kuod1utl0pc0mho1ml9vn0qbd7/noxijagunoxu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/13578297756.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076363f78e6d---soxurawuromozijolini.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/petam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=list+of+famous+books+and+authors+for+competitive+exams+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_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 19400 bytes
SHA-256: a23b59677c45fa385f7795244aa9abf3a17d6b85fea8604bb7eeffe69fe494b8
font_01_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 11296 bytes
SHA-256: 943c9efbdc7ead6079caa3c10a1938b06b19238b1be01c88bf8abb080457d290
font_02_sfnt_off00014379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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