Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce8603813b52565…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 23:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84efab2a2d3492e5cd0bf900011a63dd SHA-1: 6d2ded6f832faf52c774784ee3c54c643348eb9c SHA-256: 1ce8603813b52565ecd082e32ae8b65eb4218e8a8c58f156a1b3c853bc635693
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://queure.ru/uplcv?utm_term=the+meaning+of+babel PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd025333d4---nujokimupipebaz.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31429903912.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/87217938026.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d71a719d---92036886820.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075104791939---nijosakup.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c231a676d92b177fed02778e20324c88/32371091193.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/32391774875.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7008e5385---31567016101.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/tokapiginetimepuru.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/22418749990.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/gekosotixopunonomam.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/65010f6833c6d3541f52325f932fe542/renajisuj.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/079d31fda16616160f40d67c7cccc081/43142555742.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b854d9612---nebuna.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c4ac7827---34979115668.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/11074f789118ba861601d0201b04cebf/25453987505.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/97326871990.pdfIn PDF document text
    • https://goodline.by/userfiles/file/jupuxitidit.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/bebijededi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f97e109---fokevuxudipimun.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wipuwezoni.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zuvomuzolepikazos.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25868c9165---15487304796.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 17548 bytes
SHA-256: ea840a3062c76681c8014b8b617767c17b95b41c821f52e26fbde075c8ff295b
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 18772 bytes
SHA-256: 71cd810e8da279de5727016247562e58da657fe1a78d37fde999eab2bd64058a
font_03_sfnt_off0001635f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1635F 10400 bytes
SHA-256: 3669203bc68a94fad791846aa95bc14d5331e244e19af6f36d069dc6d29d0fec

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