Malicious PDF — malware analysis report

Static analysis result for SHA-256 a073f5465f9df256…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 04:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d735d8c0795977069c05a86bc2d15aea SHA-1: 513e99e8536cb0f7363a5097b910a89070f6305e SHA-256: a073f5465f9df256cba0f16f0f7c664924a70caf1d727de7f9e9fed0275659f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external resources, many of which are hosted on disposable domains or appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it functions as a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://777mto.com/contents/files/zudesupiwigosisuvazira.pdf In PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/45749919824.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/65324026449.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wasaropufukoji.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/sepulemolana.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f976a7788a---711045397.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/pobote.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/gologufidakumaz.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/84404869843.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/97454efa7f113b411de2c46355a61caa/ruduzivepabeket.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/71265407478.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/volofota.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/34028662867.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/822213761.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p4m1m4j9mbdt04cre100ffst03/86992948651.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/28804934022.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/53254805110.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/vaxad.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/wexaximumij.pdfIn PDF document text
    • http://hcpcsz.com/upfolder/e/files/20210923065553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shiva+trilogy+pdf+in+englishPDF 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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 11032 bytes
SHA-256: 60c606d0cd6162fe27ae08b07e15d4240c2e6ce98582f572b672211917834728
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 17832 bytes
SHA-256: 8a6a768aaa7110a80be021337ca50ac6b6ee0483e9bec125b5bcd4580ea341ee