Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea4868c14db1e3c…

MALICIOUS

PDF

92.0 KB Created: 2021-09-07 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6201fd0918eea013aa3d69b91c007f94 SHA-1: cb47828f18e912d09d42f84041047e40b4bc488e SHA-256: 4ea4868c14db1e3cbce4559e1c03dcccc682d0226db399af9cf524f5fc64e635
176 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many hosted on disposable domains or compromised CMS uploads, indicating a redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fontaine-eva.fr/userfiles/files/78360175842.pdf
    • http://inercial.es/uploads/files/54555027868.pdf
    • http://esejsc.com/upload/files/66306949799.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/galonag.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aef21775ee38eb0ca548bda812df5e73/watixiburale.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/2sus11jrn9oquffteqp66nt4u9/rarotozuzifuminufofuwega.pdf
    • http://whatcanidoforyou.eu/publish/file/92280154633.pdf
    • http://starinviter.com/ckimagefiles/sifoxojewu.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://mstreatmentadvances.com/userfiles/files/rejujoxavaraxobipotu.pdf
    • http://captaincook.hu/userfiles/file/koneruz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e976489bbc8---vunegasitem.pdf
    • https://sjalikave.hu/pictures/file/55479835771.pdf
    • http://architettoangeli.it/userfiles/files/vofiguduwa.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9d440c2d7bdae89e7d6836c4c355f4b0/vurejutalefovefa.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/633757cfbb558dd61ff24c15cf3a5084/luweg.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52239c813---julumewa.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/86193163713.pdf
    • https://akamercedes.com/images/uploads/files/70297699237.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a240db2fa06---kiraletalasekevige.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/18455950678.pdf
    • http://www.wiz-fac.com/uploadImg/file/zupemogikiwijedawadazubi.pdf
    • http://haai.org/upload/file/rasepiru.pdf
    • https://togeltop.net/contents//files/tiposukaralijazer.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=uc+browser+web+to+pdf+extension
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
font_01_sfnt_off00011681.bin
f394af0f425deee5be8a1863f63aaf1e9765fb6718cc9ba612c3b34f80371b91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 19452 bytes
font_02_sfnt_off00014984.bin
da7672e4374d957a2a616af094e34477476d5c5e009e0f6f56dec4dbd90f3fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 10740 bytes