Malicious PDF — malware analysis report

Static analysis result for SHA-256 559d3722027f7165…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 20:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b95d027335270a25ebb393032fe636b SHA-1: 48e5051d7e00fc471df24d816b1a17528bf54f5f SHA-256: 559d3722027f71659ec5a913338ec1d42e6b3b467b9023ec7292fabc02eaad69
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. 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 downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://catamma.ru/uplcv?utm_term=2008+physics+gre+solutions PDF link annotation
    • http://sgyscom.com/upload_fck/file/2021-6-20/20210620222639840975.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/005c1745ca3d0bfcc733732568523b93/visebuvenenex.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20e5176358---26408095741.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fopiluninefekunisufinev.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/84100753638.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe56b0dbc7---51608241112.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16126ba53c1d90---439698129.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/10486231897.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2r8fg9m84qlbrtfo1kqrbg1mc9/78597112196.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/vasirupavidilu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/550397qffpjbkp3jlsthev9ml3/1853204204.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/valevemeduz.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/1187598580.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/031714d0cde9aaf290088a0a555f088d/jujuxukibaledawevobenaka.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/vowixalizajoluxegije.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210808_062047.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/05300dad7354d41ee440ef81c5aa6bfe/15557048365.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/11075777713.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/bumineketaxa.pdfIn PDF document text
    • http://annabarons.lv/files/files/125606378.pdfIn PDF document text
    • https://studiorampinelli.com/file/gukapulidajadasizo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/cc5573a0ba6d5f60dbec9a211895746e/33177049113.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///fufoxepexine.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13531760817.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/juvediratexuze.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/45170218123.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/43622736400.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_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 11056 bytes
SHA-256: 8a763bf8785d8f9b8f30eb92fd24eeaf8085cc2baf125ab3a3588050ba5cbc93
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 18984 bytes
SHA-256: cbc521a340f4ba9d3e1908b0c75fae3c8c3b6151f590e96cb76483a4166d39bd

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