Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9e6a4108f37732…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 08:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71c2d68e99fa9094e8c0dc7f0025b5f2 SHA-1: e54e1a3e5d7eef2d30e8408e6903a8edae6b83cd SHA-256: 7b9e6a4108f37732e544c0bc6df08005abc97bd4cc54d3ed10656d2597d0c7a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery through a link farm. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075662a479bb---lumazavuromutevopina.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613290f29f21d---ririkabibolenobe.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/33487979463.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/13399315222.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a6c0c2404---zajemesitan.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/sexatakeziwa.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/6569177830.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac745c1770---73820456736.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9889b94e4e---mojanatenin.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/dezinibixugodukij.pdfIn PDF document text
    • http://wohntraumgmbh.at/xivokovulixijolep.pdfIn PDF document text
    • http://toroisg.com/public/images/files/68894321069.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc78decb49---xisijugefabujazo.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/worexosudexiw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f898f86a---dumoderi.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/53538499071.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/93920846043.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4cce646dbb0115e75e7f7fb5516b6001/96377383826.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/muwuvaniwilulodeje.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/peloxa.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/28044120291.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/47129214949.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/denevonosazirakus.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/094aade4c4b91ef9db5854a616a6f128/87446940045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=orbital+motion+interactive+worksheet+answersPDF link annotation
    • 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
stream_003_off0000bc97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBC97 18592 bytes
SHA-256: 8cd231ffcbebbec642514ccf78428d464e138e662b3e1f56dbec316eb9ab3635
font_01_sfnt_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 15332 bytes
SHA-256: 550ac48ab9bedc8fc66e9d88513070d0d8d386292fe0df82c16d9e79c3363e2d
font_02_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 10904 bytes
SHA-256: 36c0285dfd0a075626c722797141015f2c3ae3db025ca93fc0ff4cc3748b545d

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