Malicious PDF — malware analysis report

Static analysis result for SHA-256 3275635ca2721c2c…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 14:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 15dcd831cc52194fa8ab9387c2b85691 SHA-1: 4c5d4b051076fdb0a0257f7bad65fb91c15ee668 SHA-256: 3275635ca2721c2c19ba6b2ff382e15f917996eeb6deb3433adb2c83dce0e0e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50bf6c2f46---5891461657.pdf In PDF document text
    • https://hoavily.com/uploads/files/joxeseg.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073abf81e3cb---jesojoremosegotulofow.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb3b3c769---daxutawadutawepokadulimud.pdfIn PDF document text
    • https://o-dance.com/upload/files/85118953259.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/2018181483.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/noloruze.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/pedeverudilikukav.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/gejozomejaromirikir.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/kitirutolexesazax.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8c50c4843b81d6b5926896921ff38d57/18508698615.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ut8rkmm5d8lg7it0rkadc6dt5k/sadefisozuvo.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/motobezorokar.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/takajulusoferijupekidoli.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/tuvesexogetanogenakutof.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4e78d8ce---37352430223.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7dd5a387---faroka.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/49372805970.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/wusutukoroxowilegifu.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/57186796719.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/84385263372.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/zapek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=salford+chipping+nortonPDF link annotation
    • http://irodori.kir.jp/files/file/nokasuserarotibobuxap.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 17316 bytes
SHA-256: 370c07bbde38e9558965083048eb0bb76b7bb25d9404b0f7fffac972199884c0
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 10676 bytes
SHA-256: 3688d5832316da77942af1cbea3adea67ece3284bdec407ec6eb8ed0f741425e
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1