Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78d41007b6637d2…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 13:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81cc65d39e5b4ba6b197d477ba8dd805 SHA-1: 1fc2d194736a98eb8f0cbcda4422a14a73561b35 SHA-256: a78d41007b6637d2a9d33d6f65926a4a6b7a9691bf24177327188080e469dc64
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=pms+10+days+before+period
    • http://marcelponjee.nl/ponjeefiles/file/99112796004.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/61c733d00af4b0f0fea42115959505a6/jepos.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/irlp0rg5u10ppcs2tskccdeap0/11277180024.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8cf3d5e26---86543769700.pdf
    • http://aire-limpio.com/img/editor/file/67234331814.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f33d6fa58---jajevaju.pdf
    • http://kapelski.pl/userfiles/file/13192918825.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ffebfcefedb73fad9ddc087363feea09/73495810197.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/316928cfd4a4f5b0f0a616d3c1b1160c/67613764118.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b7f243dc0---29393361163.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2ebc3249---vodipapefugapidel.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/djsldb4lrdetq6t8ahcs4pu2dt/19230032482.pdf
    • http://rhondachem.com/d/files/wijigavovulenupuzapajo.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/27351856946.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/pitopinikejofifedinufi.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210629_03413521394690AE.pdf
    • http://brandnewgoods.net/userfiles/file/vipazolof.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/68156187774.pdf
    • http://barcabianca.eu/upload/file/nepidozazamedazerenaxiwow.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d94a6afb5---voforote.pdf
    • http://selfmadefilms.nl/userfiles/files/12647697890.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/16cb66bbc308cfe27bc349faca17d056/31971109388.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f3ce9f3f9f3f474abe2299e0b4ca9a4f/molatan.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4cb7d83e7a442671a0a886d901c2d6f5/16764390170.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b8b66a20---muzizokejet.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f778a6d0---jejak.pdf
    • https://perfecthospitals.org/FCKeditor/file/bikifimotoruw.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b5582be3545---zotewonivulozonasawares.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_off0000d438.bin
a4c72d6f5bfc3cec60a245c26d46bdf168867c21f29ee3c87f8142969b6ccee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 16224 bytes
font_01_sfnt_off0000fe49.bin
5f2513e30a48d0716e6a287349f27ee5f9ce10f07557d7d20e9670a3e6f35f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10840 bytes
font_02_sfnt_off00011726.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 16792 bytes

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