Malicious PDF — malware analysis report

Static analysis result for SHA-256 23041db46b247873…

MALICIOUS

PDF

97.4 KB Created: 2021-09-03 01:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74b4fa3a2319554e4590ea4a70e1a5d3 SHA-1: a1490d4c83a76855215b9da6b951f4fc3052faf1 SHA-256: 23041db46b247873245186d4cc04e36ce58d39efac8a46b1333ac44cfc9f3e57
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://toyotarent.tw/FileData/ckfinder/files/20210625_0831747F4E2ED182.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210902_59EC10DFEF1F460B.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/nerubamisazuzekazidini.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/digakunipawisagisaz.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/lefiwi.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/87633333510.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6rvhoh6cfbo8hbut1v1upc5lop/kanosituw.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/fatubewazugakiju.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/nelumelofifemup.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/nuzesaxerolikob.pdfIn PDF document text
    • http://jordan.si/dokumenti/file/gimiguzewusezawubox.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/1100701360.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nekarubejoralale.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/29829681596.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/9240525773.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/39241463591.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/65732334772.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb103a1dc1---nidadidomutojetufi.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lukodasopula.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/21846374744.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0c1cb46f---68516502725.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/70783377105.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/koxewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chapter+books+for+1st+graders+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_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 10848 bytes
SHA-256: 80e290b88a8e2d0d0ceaa862817e1706de471d8f1db6e35c9748123b1b646ec5
font_02_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 18016 bytes
SHA-256: a07e67627fd14aaad6fc3bea4b2cfb7b0a1f1e910035f7ac73425387f0a7905f