Malicious PDF — malware analysis report

Static analysis result for SHA-256 6092af6cd2f69565…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 12:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39024372f22c9fd784f341cbcf5e5e85 SHA-1: db8054f8b064a9ebe2ea38714098f3a2c78a5b00 SHA-256: 6092af6cd2f695657bd980b5b68be5c5d71fa1a5f8b40b86cc4f04b87a5e303d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://uleiuri.ro/userfiles/file/22732701944.pdf
    • http://kotolantopeni.cz/file/zidijik.pdf
    • http://bentleyplemtech.ru/userfiles/file/vonomirob.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140923baeb4d---77341185790.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/rokepazod.pdf
    • https://aczv.fr/userfiles/file/joxajadofozokow.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613f215965062---25518615310.pdf
    • http://thessalonikiflights.com/files/files/78886574994.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/98966417427.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614159eadd9e7---bubanogunekuwadinatozu.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/73448894918.pdf
    • http://makaroma.fr/upload/file/35327535546.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/84423910390.pdf
    • http://twtipa.com/upfile/files/2021/09/14/timuvamuwut.pdf
    • https://grupa-energia.pl/attachments/file/tajoredorazebisa.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/mefabufal.pdf
    • https://ivanda-commerce.hr/userfiles/file/larasisabaso.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb4a93eea---94047505105.pdf
    • http://imi.vc/upload/files/42411480724.pdf
    • https://novsport.com/content/File/65065704529.pdf
    • http://letresorellebio.it/userfiles/files/dofovade.pdf
    • http://www.rannatennis.ee/data/upfiles/files/92981479877.pdf
    • http://baugeraeteverleih.de/benutzerdateien/begexakagosijixonanopezip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=prokaryotic+and+eukaryotic+cell+membrane
    • 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_off0000bf20.bin
6e7525a0c51bce6086c9e37e636b01770dd25d1e414db3542c2657b67de7b0d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 10812 bytes
font_01_sfnt_off0000d811.bin
2f70adeb79dca8e97d023a764791253e1de6771998dd19edb299a1e967a364d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16372 bytes
font_02_sfnt_off0001020f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes