Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed00a0fe1d1f5eb9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 23:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: acddc15b925b92f7537a331accc554dd SHA-1: 5fde96fd46ed90ef0c6636e91834dd0ad0d81bd9 SHA-256: ed00a0fe1d1f5eb94556966fb49a51458d2a07693456fc0aee95ff0332562330
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=handwriting+practice+worksheet+for+preschool PDF link annotation
    • http://englishplanet.info/ckfinder/userfiles/files/dutinijevaralewawiviji.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/lelojosomafepal.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cde052340a2c6632ba346971b0c4f30e/71295766173.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zakujozejugasikun.pdfIn PDF document text
    • https://areicon.com/images/file/zabaxijajozepolipopebasa.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/56269874688.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/gafoti.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/44588717542.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/vilobemujuvisejaxenusi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ph5423bfrfg1ko9gmbjahs5apm/losojulux.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/88686820365.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/91804133543.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/21288445482.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210808_1D846113959A9A93.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7a339f1a6---87386800011.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160894103e8c24---45487320682.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/60889450569.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kuwewiludebej.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/43479632622.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce043ae37---26608362998.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1b8aa494676f80cef694b3630cb6a4bf/doledibapobuwezavojiwi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1a7fe7e41ebb93c86b9cfc8611c0c789/50245610271.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100fdd862a68---52681256822.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430222929387351810.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_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 11068 bytes
SHA-256: 1c0b19798f71812335cb301a9f0b58cc598fff115cc04c84932c5757a2e87c25
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 18032 bytes
SHA-256: a850ec0c3ef543703c023091e5ceaf86001d342155707da9cca7ee4de47aa32b
font_02_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1