Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70c038f87df9ef2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 10:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16c068fa32cd15f92da9faccb0701895 SHA-1: ceeafbfaa5c6a45f5572d59fcc58dbc2a0f43883 SHA-256: d70c038f87df9ef277e5afb45e5714e9522208598f4d81af6b9ea00d553e82f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to potentially compromised or disposable domains, suggesting a link farm designed to host malicious content. Heuristics indicate the presence of a download button lure and ClamAV detection confirms it is a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ucg-eg.com/userfiles/file/pimetazoko.pdf In PDF document text
    • https://alsultantrading.ae/userfiles/files/55882765718.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/55283337895.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/gutenawadudozop.pdfIn PDF document text
    • http://195exim.com/datas/files/30612693866.pdfIn PDF document text
    • https://33mobility.net/uploads/files/84290570940.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/89161656911.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gufib.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f37fecada---28261323644.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/bosajuvawikomevom.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea83c75a26---juzibogat.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/9639690177.pdfIn PDF document text
    • https://anakmeong.com/contents/files/vunovebudil.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vekebefowadaguneve.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kufogarolovofewasuwito.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/49201096211.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a2ce39ff7d5345d0a70e11c17201ec1a/32826422566.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/maxituvejobovujowedexirez.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/morujowasewerixuxukejojo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fabusizizo.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/dokatawow.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/jedosetukosozaluv.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/lulirelukixepajazi.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/fafavoxewabotovesusiguxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sadugudu+vandi+tamil+dubbed+movie+downloadPDF 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_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 17452 bytes
SHA-256: 4099800d548acb7dd2efaf0974690e9d299794318d01c3344f85611dbbe7656c
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 10788 bytes
SHA-256: a53f47ee0521c44d4993b19787c93817332ae42e96b206e11967243faa446030

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