Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a18b1fd4757a46…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 03:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 404b017e1c8952eb26f41f37894a3ab8 SHA-1: c636893975ef0fc11ad471e48239980768938b7b SHA-256: 21a18b1fd4757a465bf97fa168fa347dac6a89cea6543fdf81f35a67cfabac3d
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common tactic to trick users into downloading malicious software or revealing credentials. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/uplcv?utm_term=online+conversion+of+jpg+to+pdf PDF link annotation
    • http://applexin.com/ttpsea/files/file/siperezavav.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/74490115849.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4gvhbkuvma9uio5s3cqsvahmdu/54969731953.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/63928158400.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/radejatatojiwavujikeba.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/wefimixodufiwok.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe4c24ca---debeji.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/ruxoxowazomovegobironod.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/miboxefojakopozexokok.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/99764933491.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/lugikekowonuwabimunu.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/35690420366.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d097484f2eb---40962864933.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/pefodenukitajiwolojakedoj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cimld094kjmptem8ac5avc9th4/79131919289.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/15224079877.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/56oel8u57rq221csperu0p1er4/97553568084.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/55422691781.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c63650e5---xexaguso.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079654d71887---44246717961.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0ad5913c293242be51181efc82aa577a/xizefodafetosumikeluno.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_off0000b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 17480 bytes
SHA-256: 5524a35b608326f2d45859e4308730e346685429db80e7d255fe4c84ca5676e2
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 10856 bytes
SHA-256: f34c72c49e3e344855dc61ea0c3e0f54f10a6873f39dd173273c88633bd26235

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