Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7461fb955af12b…

MALICIOUS

PDF

75.9 KB Created: 2021-07-17 09:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a2b5fc8fce2d6e21a4f8c01670127bcf SHA-1: 0f0c86161b56f80e9125afe099525cdd31f21daf SHA-256: 9d7461fb955af12b26b83d8a000eb4c8365cd385c7418d1ba99857cbbfc8e1fd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for phishing or malware. The presence of multiple links to compromised CMS upload directories suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6125897fda---tolegimezogidamovarig.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/38418956868.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b7856ad7ccf7b69a5f1a091b33abb50d/28097570439.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a807c61b899---70471917161.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8c7cb7c9---16256851055.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810698609b4---getenoluladunaduxozila.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/24857038331.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d951081bde---jugajepijiz.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/21697438507.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/doram.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/pju5dgpfvuc100kdh2kh64ajcj/leramexi.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/140ca7ffd875441e44dc809e7c25b67f/46385614710.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d8e90d15---davikerogororosexapi.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/gevab.pdfIn PDF document text
    • http://promador.pl/userfiles/file/50790291661.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/wonowawonakizagekogepav.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b8fbc656ea97eb2b4de8bc314914c9c8/65764853913.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/juditozalidokakepafu.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/notibodusesuzugonabale.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/34522100448.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1e084f98e8051e884ca804de676a26d7/98788497811.pdfIn PDF document text
    • http://france-ex.com/14402946895.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/56538143801.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88694051836.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/85620614864.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/61004082221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=whirlpool+estate+oven+manualPDF 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_off0000c91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 10676 bytes
SHA-256: 23145495434838ddf5b360972b68ce0b74d2863c6e6f0fefe617b7ae94db0936
font_01_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 15756 bytes
SHA-256: 4566e4d64f0f94a3e7bed8f32cf2a9237ab9050a66aced4c911d8e0f9b7dddfb
font_02_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1