Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17346ae3b103040…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 10:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e6968b854d89480474639d65efd8639 SHA-1: d3e77a1dfee7f02d88a9dfac7712a92cde30dc42 SHA-256: c17346ae3b103040c2ad61c0b70b42b80a12cf636b06736137e1a3cf1643b7ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution, aligning with Spearphishing Attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=celebrity+voice+changer+pro+apk PDF link annotation
    • http://konditsionery-reutov.ru/upload_picture/file/sebixujepawub.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/widetut.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/tasedonowemibaka.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161339781405d3---bikabuwedakabis.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fofesomupemoxalibu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/80696476727.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61272702611.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139199245f2c---vonurixibazudegofomegiw.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/ketapi.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210901_E781C46EF65F6B04.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/57245390574.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/jugozopigobupukal.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/68932419188.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/disenavikuzorolurexu.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/81923710103.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hr80k5pht61a636qbk84401fgs/japamiberagibadubor.pdfIn PDF document text
    • http://infosierra.es/images/editor/nujazafekesafag.pdfIn PDF document text
    • http://marketingnews.fr/images/file/37383983553.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/68526552017.pdfIn PDF document text
    • https://tomas-music.com/contents/files/filazumiwipewuza.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e175dbe4---rodepepulitovokadatag.pdfIn PDF document text
    • https://digireg.it/upload/13741866181.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/40924873996.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/vukafujoliw.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21898141349.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/71366717953.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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 10928 bytes
SHA-256: 4b2c7b43cf166a5817f865b8a62172e81dce5a6c2995092798c432618417a285
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 17956 bytes
SHA-256: 87a28b07fe6575ddffae62c6673bb3c9d6216ac3ee6293209b013775d8fb6962
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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