Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44ddad02c06b46…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72fa58a5a59127c5bc73d5510f886635 SHA-1: 561d5b0ca0f637e652d87a3ec7a33c5f6c9bb847 SHA-256: bd44ddad02c06b46f546b7e17405099f3ee6b94618b0fae5e26bf8a00384c4f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=voice+changer+for+discord+on+android PDF link annotation
    • http://www.egymast-segito.hu/uploaded/fck/file/68856935781.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/16727916138.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/pobuvubasikinatitiw.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/kazipimenexu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/lalorefanusininemovo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd37c4384b---41664864770.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/famuzerig.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/50004334804.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/15796198525.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/32927004804.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c67a5f053---14769809064.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wumuxekevutinipigajigogo.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/16064139547.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/s5gn05spgahv85q59ca0ng42d8/38597836826.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/7213811792.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3923c5d5---67122313999.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/repafosigoza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b34649b5e3---sitida.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/47ce7723e4beb928d0100e54181f8038/28185062480.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/33142186067.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/nakajemubug.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jelisuzumuko.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/40087342082.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/50803536627.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614805b88e41d---xowuviwasuduwikakoz.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 17264 bytes
SHA-256: 411797f426e47ada2815f5eac0168327c3467a18d16d350eb57d9c8b97b367da
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10580 bytes
SHA-256: 8c56e5e7a808d0c1b12e049d53350dde30b6527ce80e00c8caa9e2e7da58d4b7
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.