Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7b5fb9b95ef9d3…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 16:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7667269ff46749274879273565038dbc SHA-1: a71a4a65520f962227b1fb3eba82e255dca0e269 SHA-256: 1f7b5fb9b95ef9d338d12041771c5d829792854c357b2291e86c9b565e2a24df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised WordPress sites or other potentially untrusted hosts, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ibookingkr.com/FileData/ckfinder/files/20210915_57EB066CA29ABDD9.pdf In PDF document text
    • http://nexxstep.nl/userfiles/file/87704136444.pdfIn PDF document text
    • http://letdentalab.com/img/files/sesemegilelix.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/3516390743.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/xezemupipasowura.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c32ba179---89034906401.pdfIn PDF document text
    • https://redac.ch/upload/fekosixibivis.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161406abda2717---25253650995.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da0b246c5---47526518253.pdfIn PDF document text
    • http://seritour.com/rsm/files/jinevizivasuwadapuvoxub.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/47207171316.pdfIn PDF document text
    • https://etadelloro.it/images/file/juvevobadaxavudo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/golilibonawizijidujobe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jobujamoripukagi.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65501202340.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geparupojavubab.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/disubaromapidekogejab.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/nejozuta.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/67101771154.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/71086827279.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/69319828922.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wifovigidasawogaja.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcbc6dbf1---xefuwumurage.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/sokajir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cual+es+el+mejor+reproductor+mp3+para+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/61f52687cfbfd8c5b113c2d819722dbc/jamemesenekapaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 19208 bytes
SHA-256: 12511009e80e4284a76555570ab7edc8f333f4aaa421b66e884f1724878b53e0
font_01_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 11108 bytes
SHA-256: ef5ed298e7b5c396b3d0a85e359405c70154baf9e5e23c66185cdbf2f8c64b9e
font_02_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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