Malicious PDF — malware analysis report

Static analysis result for SHA-256 d370917cd7a055d1…

MALICIOUS

PDF

86.4 KB Created: 2021-10-16 01:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3edf4fe564b251606266e202d894fcc4 SHA-1: efe4d4156f9a86019d21c25e9b92773c8707f3b6 SHA-256: d370917cd7a055d1ba4dcd19ade873100bf0a6762faff1970140c4a4bd8b4ae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/50676776052.pdf In PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/butexefekexulimovadepumep.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tokudujogetuwomadasege.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/rixalaxagojosidixobotoj.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/97429857814.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/bekejo.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/kuweturirokesafamu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/kenatisozoruteninelamojo.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/nabufusetulul.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/45495740959.pdfIn PDF document text
    • http://ud2-140.com/files/46475259544.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/fosavixorezugulo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16169f05ec9127---50738227039.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dejudozuxigitivi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6ef72ea2d---24468453031.pdfIn PDF document text
    • http://ergakiland.ru/files/files/79508252324.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wofijitofe.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a8351c8210d95376f7845f679a43e62c/zowasobikevezawekefifikob.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/68957929079.pdfIn PDF document text
    • http://clingac.es/d/files/sevuzovalisopazifilikuruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=inference+tamil+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 10344 bytes
SHA-256: e02411323ab7d3cb5acdb979cbfcde105569c4d7e0e3733c211f7c8215a6c367
font_01_sfnt_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 21972 bytes
SHA-256: 05ad8cfa1fc5a9543b2b15d9b6f60710ffa2a441531fb4365ef25eb3b89cfc14