Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee0c63ef2d8d225…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 08:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0bb83e37798f0a553d38fa3e28f2b9a SHA-1: d4c7a1ea51ef16f0119234dec09584af2da99ef5 SHA-256: aee0c63ef2d8d225b5c434c2e8ceebc53e5877f1af128eae6ec4be6596459ea2
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://aplusadvance.com/naver_editor/data/file/34583904108.pdf In PDF document text
    • http://nhs1968.com/clients/65482/File/bipelijule.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160905b4ec147b---gikavigibewe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc97b538718---33376557497.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4f1448d9b31fe410484a11680b97e510/rikutopoju.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/debenerizik.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/57985728926.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a0ca4131---robowumu.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/46723818436.pdfIn PDF document text
    • https://inncredel.com/uploads/25946308417.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/xopobokulaxuxorimasopide.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/66702047085.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/rebafopisejawijelomadava.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/buzapovividebit.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/tugeputowo.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/faxufabipudo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c77aaf01cf2f34c0e516da0ec16880f2/14116412620.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/94035e808ce3fd6a8ab9ae32c5512c35/piworosa.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/raxufodobafede.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nepibilomesusuzukemur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stone+age+expansion+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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10704 bytes
SHA-256: 6b15a64a51c87b5452f44f24253efea2378dcc2e2c41d307fe4ab636dcad209f
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 18232 bytes
SHA-256: 2e60a9827ec83ec6a5cdff2d8628cb3f9c7a651e85afd5d41be2122cd8bb5384
font_02_sfnt_off00013e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1