PDF malware analysis — malicious · e4b38d8b3215506d

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 15:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: fb98263b56b0af28a1f441bf23b2d592 SHA-1: 6b3dc2b57f85e3277a847a730e1a5807687fd8a3 SHA-256: e4b38d8b3215506d50a1624fdb3c28a489ec165e74ba25f8e451ee33311c5d62

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5522debc3b---37060580764.pdf In PDF document text
- https://domilot.com/uploader/files/dikalasazel.pdfIn PDF document text
- http://bezpiecznamlodosc.org/files/file/87933160109.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/73918696217.pdfIn PDF document text
- https://actorconseil.com/files/file/30131153303.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98846f9c8---50451582741.pdfIn PDF document text
- http://park-seversk.ru/other/js/ckfinder/userfiles/files/92113297078.pdfIn PDF document text
- http://wib24-admin.de/uploads/file/girubu.pdfIn PDF document text
- https://nepalimodelagency.com/userfiles/file/71974676234.pdfIn PDF document text
- http://fujavietnam.com/images/Download/vopubudeketajojogedirak.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878fa6d21---bapumevisedimegojuxonet.pdfIn PDF document text
- http://mayinmaunhat.com/upload/files/71942102178.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c31492f13350cad3e26d3f9d5ebd8871/robiwulokovipudal.pdfIn PDF document text
- https://vrindaindia.com/php/joseph/uploads/file/xukazibimodudone.pdfIn PDF document text
- http://fitviewer.biz/files/file/40074819775.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/37861187459.pdfIn PDF document text
- http://inruho.ru/ckfinder/userfiles/files/gibupofojuwijatakekebizax.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c307f3f77e646dadc4df9ad10e53ef85/96107804016.pdfIn PDF document text
- http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/xakoxisobolimuxasupimafa.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e398c65e1e3---93403286564.pdfIn PDF document text
- https://festival-bg.com/media/ckuploads/files/mitiviga.pdfIn PDF document text
- http://amoy-art.com/Upload/file/59584361077.pdfIn PDF document text
- http://huh.hu/UserFiles/File/96599874181.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bce095702f0edf4fb9b714d568b888ac/ximozakuzedetit.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92fd48a50---telazatoxupaxilowiwudido.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jrco9mbpfrn9jhlpmieopmboli/69289142340.pdfIn PDF document text
- http://ladyqueen.it/userfiles/files/nejanerefo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=more+than+less+than+worksheets+for+grade+1PDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bc45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC45	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d45c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD45C	10764 bytes
SHA-256: `a94cd675d3a9c20d812f56248e110e038a1907beba01d76be3a699445cbcf727`
`font_02_sfnt_off0000ed04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED04	15720 bytes
SHA-256: `e6b2f8241ba57a0d274d975f0a6c7c0b06e0de4a1eda0d2cf20e179b655ebb04`

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