Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33a7a9d79edcd8a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 07:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 907af85062396731b273e1c999e07f69 SHA-1: 73dded667f1156b2c1b0aa89363d4f0331fb8a85 SHA-256: c33a7a9d79edcd8a5cc461817de4db2dc7d7a0b84a7651a723347555389fc801
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis point to a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drakbera.com/ckeditor/ckfinder/userfiles/files/32701031536.pdf In PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wuvigejajotux.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/96934468879.pdfIn PDF document text
    • http://land89.com/ckupload/files/wuxujefofulajademinirun.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/nuravimisilarujan.pdfIn PDF document text
    • http://secretinvitation.net/images/files/62625364791.pdfIn PDF document text
    • https://computerzone.pk/file/xalime.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/nubaluxawemi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614d303599457---44776809861.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/rotuvatujimonobadufezubob.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/23c307f78c4a470bfb95e0d9588ceff6/tamudatudukinawap.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/sulurevolosedim.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/80276509843.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55934413753.pdfIn PDF document text
    • http://bscartridge.com/pic/gukezivulafaxedenoxewuva.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/worujesovo.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/sowufujoxusoliwazejat.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/zolozisotala.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/puxexezik.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4uk195v65l38pb5h4sl8klh55i/tegegud.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/mabejilimafazilodimizu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/68695043352.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c38e94282---volovororoferuganonokaji.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kufifajiv.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/62614143973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ios+hack+coin+masterPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 20368 bytes
SHA-256: 15d002fb822a0b6b7aa8d652da8e458cdaec95f3afd33c8aa513632d22d6b159
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 10492 bytes
SHA-256: a12b1eea5c29e582596dd7ce8adb6a883ab909a74b277b1bcfab244f0c6b97ce

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