Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a1cdebc17efb0d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 03:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6918824298bf054df68f954e055f2cbc SHA-1: d15afe49001f5da07eac821c5a66765893a6e11f SHA-256: 38a1cdebc17efb0dd22c86b167c14c8c8c4818efa1e460dcbe152fdc7152a632
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://geyuping.com/geyuping/uploadfile/file/2021091119514973499.pdf In PDF document text
    • http://rsport.eu/yonexshop/static/file/jepedofamajesutekalidota.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/pogogumarixuwurekupo.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/raxomiseligaratukudeto.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/figunofixedafan.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/sexoju.pdfIn PDF document text
    • https://btegypt.com/file/bemeputovifakaduzokizo.pdfIn PDF document text
    • https://ikansambel.com/contents/files/loxebunixufunalabugiku.pdfIn PDF document text
    • http://m2m2design.com/userfiles/jamizetibovunimegelij.pdfIn PDF document text
    • http://cbstav.cz/file/pasibufes.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109161755067781.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/78a083c9094fdf5cb812f67487ad8f36/bozima.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/4003775796.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/fubolenisufukam.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48445022407.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/madino.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091518120973499.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/78058599014.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/zujigefubowed.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0c2f2de8e6447ab32b149d09aa937670/vapofofiwabuxiwukakigij.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3edd0780fb83599d67e12d9431ed284d/rironidibukafa.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/ravanasiladofejeko.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kamukezazezurexinijizaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=aplicacion+de+acordeon+hohner+para+android+gratisPDF 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10772 bytes
SHA-256: 5b59853633149694f160105e01139c8a24dc626bed03177bd51cec8594733533
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 19252 bytes
SHA-256: 262d3e58b15026356b04f7450c8b8d59ba7f1a6c0268f87b7bc78e4ff15e851a
font_02_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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