Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e3b6ef52886334…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9344fef16a2f6133e39d6aa0d79cdb6 SHA-1: 7f5bc890d2149643657f966b490627581608821d SHA-256: c6e3b6ef52886334b6c170d384a8350a49461f7ef8faec2407fec5e2c0228672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=isaac+tarot+cards PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b49fa455a03d3a3072a8ca45b71ec732/veritunikerenerumazuxiloj.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tawaxame.pdfIn PDF document text
    • http://www.agot.pl/upload/file/dejirobov.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/jodiwaxodap.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/nokuse.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/vumojajezixeruxuk.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/18203629733.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/64594467747.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/32243157808.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/jegajorumeba.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ba4cf4db510fb07e9038659c6ade05a4/josunivurikagogofanetubu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc19ce496c---vemugativijozeramogajuzuk.pdfIn PDF document text
    • http://8njl.com/userfiles/files/bavezoluseziruwuborojog.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/gezujuwosarivoxeb.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nerit.pdfIn PDF document text
    • http://snft.ro/media/file/kolujapirafes.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/91013075323.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/22226956392.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/86827715156.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57847857184.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/25844609744.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6cf3f39a13e9a40e3d17d26c555fb12b/96857786976.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xagexod.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/rojodazalezirelukatatimid.pdfIn PDF document text
    • 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 9940 bytes
SHA-256: dbd25fa98071c228d498bce7fc5791ab3b6a683bd214a9376b99d4a8e23aa087
font_01_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 17676 bytes
SHA-256: 79f800f68c2fc3c7d7c275b8bc29395edba5ce5c45c16efc184bbbd5dd366cbd
font_02_sfnt_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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