Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff831d53f17dc87…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 18:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a691b012d603799bbbcf1b8ed3ccbb0 SHA-1: 54b10ac098c459ed785215a27e39651c92342a92 SHA-256: 3ff831d53f17dc8733112f5550cabf5efcbbfea52e0b86cbbf956ef980be5d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised websites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=my+hero+academia+season+5+official+release+date PDF link annotation
    • http://obkladacstvikolar.com/content/19749953189.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/novetimujefujezasife.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/taputexaxusudodanelekelaw.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/xabipixuvasaf.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/91458502930.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/sowebigopovarivepitiza.pdfIn PDF document text
    • https://norservis.cz/files/files/67875109539.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/midojelerexivatupo.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/34690544165.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/libegovizirogigix.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/83049185213.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/18609925134.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-13/20210913175105662153.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37218761390.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4605e7584---vajogujibedema.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/4647639438.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/jatigikisefuxoxaxebodu.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/17913488518.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16142954c5361b---38451334294.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/36549393478.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/71268943999.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/33296751961.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wadixugorufugekokagusuriz.pdfIn PDF document text
    • https://jurad.eu/files/file/4160395579.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/nazezidi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t1rvas79sd8l8rrkn6ova4a63/ninisix.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613825c377882---70466795258.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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10980 bytes
SHA-256: bc7114571285c0827d00a20b356f193152a920c002273996dbceaf10e9739ab9
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 17760 bytes
SHA-256: 45e4671892dac750a8b25d98c84c81a39c511f232a45dbe3acff78e42feaa397
font_02_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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