Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2104b68a4bad32…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 12:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 727ec5d81aed515c5e311fe4178737ee SHA-1: 9e21f662d4971b219ca48f4ce125269a97658d88 SHA-256: ae2104b68a4bad32e9e54cdce6ef76308aa7ea17721d53f1e5878cd51fad4b61
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/jujexutogonofasus.pdf In PDF document text
    • http://hagelkonzept.de/userfiles/file/suvenowamupub.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e66301f66d354a7be817b75f5652aa19/36594685661.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107f22d58900---6089233146.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094427913233---bovifawum.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/94890155509.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/43794814874.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792eee4c5e---86694134855.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/3804689362.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/62267379489.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/malavumotisu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/8243842333.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91359784929.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079294ce82d0---61233821203.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jmdrn976a5shts6nr5ebh592o2/kudugofobinofapajetoxeve.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/zemegodigojilusoxaf.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/tcdaetuefinernepbf65j8nu2b/tulebitinukifovoto.pdfIn PDF document text
    • https://tonitomov.com/picture/file/451118299.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/jegebowig.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/bamovamivuvaxi.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/selaralafemug.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7eb6b269---wawevuzalunuzutexure.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/sirekujisulerilaxir.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/99371222223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+are+dogcatchers+paid+math+worksheet+answer+keyPDF 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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 11200 bytes
SHA-256: 7756847239002d5ba086ee0e5999bc0b410314931198f4a65d8fcb3e257e42fc
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 16796 bytes
SHA-256: b8b2e2873524a80150364123a5681b259ed37184e943314f99f78af0e29eb0d5