Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c58f858a4c2c1f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 01:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6021ec92aa92988d62ea5609bcae370c SHA-1: 0ef029a20528999753cdf31573cfb9d1b98e6428 SHA-256: 04c58f858a4c2c1f12354012a24231922172ec3c12c300da3e91da90d284a174
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://irlanc.ru/uplcv?utm_term=download+mx+sharekaro+app+for+pc
    • https://doxity.ro/ckfinder/userfiles/files/sezipozizimosuxuli.pdf
    • http://cherryontop.pl/upload/fotki/file/jofagilidokixokozu.pdf
    • https://vendax.ro/files/file/98248395841.pdf
    • https://rafaellopezehijo.com/upload/files/32345277072.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/petolowosi.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/386173951.pdf
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/mozebimopumudusoz.pdf
    • http://straps.by/ckfinder/userfiles/files/fonanatajajawuf.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a31de24a27a997fc5cd0adb8d0e3e747/23594185569.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132dff33190e---xanusalenakifolefa.pdf
    • https://dyaa.club/uploads/file/75189733843.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/83806979983.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/40518429234.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8bc88df7e---luxuvinajorakiwob.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/34115635785.pdf
    • http://studiomilano.eu/userfiles/files/kizomupefeg.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ca62837d3e69e3a8bcc280675d1c102f/pabuguli.pdf
    • http://bjsddesign.com/filespath/files/20210921091049.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/sajodudororolav.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/27017589911.pdf
    • https://coffeetuanvang.com/Images_upload/files/51352449078.pdf
    • http://majedalkarkhi.com/pics/file/tujulofifobego.pdf
    • https://strongpointmarketing.net/userfiles/file/muzav.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/sijoxamenop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B7 16792 bytes
font_01_sfnt_off0000cbce.bin
8e730f2374f5b8f3f9af335082dedff9eb1ceb404e3930cf09c02bbb6872e1cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 10976 bytes
font_02_sfnt_off0000e525.bin
9309478bdce4fb046c374907c60ad28c993b524601bbf39fe6da7a587fc54ac8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 16640 bytes