Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bdd6281bf0555f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-29 04:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f224aebe7f0bbb51b8bccb39323eb10b SHA-1: 61795d0a0326fdbfb3207049efcc0acce07b7d8b SHA-256: b9bdd6281bf0555feefc177a68e61563d8110072f9a20ca1fe88437d1e5e5d42
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://vetportonaccio.it/userfiles/files/labujevopox.pdf
    • http://www.agenbenangbandung.net/file/depiworirubanoxugodinuje.pdf
    • http://pepinieres-soupe.com/userfiles/file/puzagorikodesovebenodikas.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/bamuvoda.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/34213162764.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/57466570616.pdf
    • http://a-aqua.fr/ressource/site-image/files/rogoxifodilogawaben.pdf
    • https://jeanmarcrobion.fr/userfiles/file/55561979037.pdf
    • http://jljemc.com/upload/files/9322189562.pdf
    • http://md-servicios.com/userfiles/file/fitenozepumabuzisito.pdf
    • http://mmprogetti.it/userfiles/files/damimuxupu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe92581257---jukikadujaninugovesuk.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/46478299618.pdf
    • http://career-id.org/ckfinder/userfiles/files/mikexesak.pdf
    • http://aromacosmetics.bg/assets/userfiles/file/25385347089.pdf
    • http://seashinechina.com/admin/fckeditor_upfiles/file/2021092714594280554.pdf
    • https://prestinieurope.com/userfiles/files/tibirowegikejorelomaj.pdf
    • http://kolbiko.com/images/uploads/file/fufozuzoralefakejijogi.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614623b026240---36111087098.pdf
    • http://movesearchesuk.com/userfiles/file/66308749155.pdf
    • http://taigesw.com/upload/files/28892998429.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/gibite.pdf
    • https://bagstyle.uz/images/file/tawutajunexapemala.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/84398406206.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b44ac33a8---fototuzarenab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+how+to+see+app+usage
    • 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_off0000b9cb.bin
f422a8444817c96e1fa7d65df7dde63275f5a44e47a9838e38bb89606c752ed3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 20616 bytes
font_01_sfnt_off0000ef27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
font_02_sfnt_off0001073e.bin
17178047f11457bf13787338a74c837d6536fef77e84c53e155e59e87de63ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10792 bytes