Malicious PDF — malware analysis report

Static analysis result for SHA-256 503d18e76e597310…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 03:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5eee6ff776ea7dc9162693300c7d6aa SHA-1: 0ba9a1f15a1352e6bee84c5e21079bc878a21df6 SHA-256: 503d18e76e597310344faf39228b76fbb9458c48fe126bcab2b3cb25ae8d5456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=deck+the+halls+violin+sheet+music PDF link annotation
    • http://vincitydata.com/uploads/ckfinder/files/kasifujokiwadi.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/tanotoguv.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/mojubebogininigevaro.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/furusojifutevofaris.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/54650040649.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/dubunixegozebubof.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/61622720522.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/nirovinotaximapu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9f13f3cf0686e337dde81a7d840ca77/93492658787.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/69610641149.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/tokeb.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c2b7932b---setifamivitiboxide.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/vedunuj.pdfIn PDF document text
    • https://jobtiara.com/files/files/netavabipetetumi.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49701691209.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/96430418098.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/sapepalin.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/57848689243.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/guvudetunafo.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/59980847329.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/sevonitatunirosasojavedo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451e0d46017---68921810697.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vazifigeluvo.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/5231734099.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikibufarek.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_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 10652 bytes
SHA-256: c3e9980ca0d8637782b59c02696aa70fbec00c4bace618857e075b4541f25080
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 17252 bytes
SHA-256: 4ea03d3aa73b00a4862dbd8aec847627892b9bcef9bd1c7e94d960a3266a7b4c

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